Objetos y códecs unicode
************************


Objetos unicode
===============

Desde la implementación del **PEP 393** en Python 3.3, los objetos
Unicode utilizan internamente una variedad de representaciones, para
permitir el manejo del rango completo de caracteres Unicode mientras
se mantiene la eficiencia de memoria. Hay casos especiales para
cadenas de caracteres donde todos los puntos de código están por
debajo de 128, 256 o 65536; de lo contrario, los puntos de código
deben estar por debajo de 1114112 (que es el rango completo de
Unicode).

UTF-8 representation is created on demand and cached in the Unicode
object.

Nota:

  The "Py_UNICODE" representation has been removed since Python 3.12
  with deprecated APIs. See **PEP 623** for more information.


Tipo unicode
------------

Estos son los tipos básicos de objetos Unicode utilizados para la
implementación de Unicode en Python:

PyTypeObject PyUnicode_Type
    * Part of the Stable ABI.*

   This instance of "PyTypeObject" represents the Python Unicode type.
   It is exposed to Python code as "str".

PyTypeObject PyUnicodeIter_Type
    * Part of the Stable ABI.*

   This instance of "PyTypeObject" represents the Python Unicode
   iterator type. It is used to iterate over Unicode string objects.

type Py_UCS4
type Py_UCS2
type Py_UCS1
    * Part of the Stable ABI.*

   Estos tipos son definiciones de tipo (*typedefs*) para los tipos
   'enteros sin signo' (*unsigned int*) lo suficientemente anchos como
   para contener caracteres de 32 bits, 16 bits y 8 bits,
   respectivamente. Cuando se trate con caracteres Unicode
   individuales, use "Py_UCS4".

   Added in version 3.3.

type PyASCIIObject
type PyCompactUnicodeObject
type PyUnicodeObject

   Estos subtipos de "PyObject" representan un objeto Python Unicode.
   En casi todos los casos, no deben usarse directamente, ya que todas
   las funciones API que se ocupan de objetos Unicode toman y retornan
   punteros "PyObject".

   Added in version 3.3.

The following APIs are C macros and static inlined functions for fast
checks and access to internal read-only data of Unicode objects:

int PyUnicode_Check(PyObject *obj)

   Return true if the object *obj* is a Unicode object or an instance
   of a Unicode subtype.  This function always succeeds.

int PyUnicode_CheckExact(PyObject *obj)

   Return true if the object *obj* is a Unicode object, but not an
   instance of a subtype.  This function always succeeds.

Py_ssize_t PyUnicode_GET_LENGTH(PyObject *unicode)

   Return the length of the Unicode string, in code points.  *unicode*
   has to be a Unicode object in the "canonical" representation (not
   checked).

   Added in version 3.3.

Py_UCS1 *PyUnicode_1BYTE_DATA(PyObject *unicode)
Py_UCS2 *PyUnicode_2BYTE_DATA(PyObject *unicode)
Py_UCS4 *PyUnicode_4BYTE_DATA(PyObject *unicode)

   Return a pointer to the canonical representation cast to UCS1, UCS2
   or UCS4 integer types for direct character access.  No checks are
   performed if the canonical representation has the correct character
   size; use "PyUnicode_KIND()" to select the right function.

   Added in version 3.3.

PyUnicode_1BYTE_KIND
PyUnicode_2BYTE_KIND
PyUnicode_4BYTE_KIND

   Retorna los valores de la macro "PyUnicode_KIND()".

   Added in version 3.3.

   Distinto en la versión 3.12: "PyUnicode_WCHAR_KIND" has been
   removed.

int PyUnicode_KIND(PyObject *unicode)

   Return one of the PyUnicode kind constants (see above) that
   indicate how many bytes per character this Unicode object uses to
   store its data.  *unicode* has to be a Unicode object in the
   "canonical" representation (not checked).

   Added in version 3.3.

void *PyUnicode_DATA(PyObject *unicode)

   Return a void pointer to the raw Unicode buffer.  *unicode* has to
   be a Unicode object in the "canonical" representation (not
   checked).

   Added in version 3.3.

void PyUnicode_WRITE(int kind, void *data, Py_ssize_t index, Py_UCS4 value)

   Write the code point *value* to the given zero-based *index* in a
   string.

   The *kind* value and *data* pointer must have been obtained from a
   string using "PyUnicode_KIND()" and "PyUnicode_DATA()"
   respectively. You must hold a reference to that string while
   calling "PyUnicode_WRITE()". All requirements of
   "PyUnicode_WriteChar()" also apply.

   The function performs no checks for any of its requirements, and is
   intended for usage in loops.

   Added in version 3.3.

Py_UCS4 PyUnicode_READ(int kind, void *data, Py_ssize_t index)

   Lee un punto de código de una representación canónica *data*
   (obtenido con "PyUnicode_DATA()"). No se realizan verificaciones ni
   llamadas preparadas.

   Added in version 3.3.

Py_UCS4 PyUnicode_READ_CHAR(PyObject *unicode, Py_ssize_t index)

   Read a character from a Unicode object *unicode*, which must be in
   the "canonical" representation.  This is less efficient than
   "PyUnicode_READ()" if you do multiple consecutive reads.

   Added in version 3.3.

Py_UCS4 PyUnicode_MAX_CHAR_VALUE(PyObject *unicode)

   Return the maximum code point that is suitable for creating another
   string based on *unicode*, which must be in the "canonical"
   representation.  This is always an approximation but more efficient
   than iterating over the string.

   Added in version 3.3.

int PyUnicode_IsIdentifier(PyObject *unicode)
    * Part of the Stable ABI.*

   Retorna "1" si la cadena de caracteres es un identificador válido
   de acuerdo con la definición del lenguaje, sección Names
   (identifiers and keywords). Retorna "0" de lo contrario.

   Distinto en la versión 3.9: La función ya no llama a
   "Py_FatalError()" si la cadena de caracteres no está lista.

unsigned int PyUnicode_IS_ASCII(PyObject *unicode)

   Return true if the string only contains ASCII characters.
   Equivalent to "str.isascii()".

   Added in version 3.2.


Propiedades de caracteres Unicode
---------------------------------

Unicode proporciona muchas propiedades de caracteres diferentes. Los
que se necesitan con mayor frecuencia están disponibles a través de
estas macros que se asignan a las funciones de C según la
configuración de Python.

int Py_UNICODE_ISSPACE(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter de espacio
   en blanco.

int Py_UNICODE_ISLOWER(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter en
   minúscula.

int Py_UNICODE_ISUPPER(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter en
   mayúscula.

int Py_UNICODE_ISTITLE(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter en caso de
   título (*titlecase*).

int Py_UNICODE_ISLINEBREAK(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter de salto de
   línea.

int Py_UNICODE_ISDECIMAL(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter decimal o
   no.

int Py_UNICODE_ISDIGIT(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter de dígitos.

int Py_UNICODE_ISNUMERIC(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter numérico.

int Py_UNICODE_ISALPHA(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter alfabético.

int Py_UNICODE_ISALNUM(Py_UCS4 ch)

   Retorna "1" o "0" dependiendo de si *ch* es un carácter
   alfanumérico.

int Py_UNICODE_ISPRINTABLE(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a printable
   character, in the sense of "str.isprintable()".

Estas API se pueden usar para conversiones caracteres rápidas y
directos:

Py_UCS4 Py_UNICODE_TOLOWER(Py_UCS4 ch)

   Retorna el carácter *ch* convertido a minúsculas.

Py_UCS4 Py_UNICODE_TOUPPER(Py_UCS4 ch)

   Retorna el carácter *ch* convertido a mayúsculas.

Py_UCS4 Py_UNICODE_TOTITLE(Py_UCS4 ch)

   Retorna el carácter *ch* convertido a formato de título
   (*titlecase*).

int Py_UNICODE_TODECIMAL(Py_UCS4 ch)

   Return the character *ch* converted to a decimal positive integer.
   Return "-1" if this is not possible.  This function does not raise
   exceptions.

int Py_UNICODE_TODIGIT(Py_UCS4 ch)

   Return the character *ch* converted to a single digit integer.
   Return "-1" if this is not possible.  This function does not raise
   exceptions.

double Py_UNICODE_TONUMERIC(Py_UCS4 ch)

   Return the character *ch* converted to a double. Return "-1.0" if
   this is not possible.  This function does not raise exceptions.

Estas API se pueden usar para trabajar con sustitutos:

int Py_UNICODE_IS_SURROGATE(Py_UCS4 ch)

   Comprueba si *ch* es un sustituto ("0xD800 <= ch <= 0xDFFF").

int Py_UNICODE_IS_HIGH_SURROGATE(Py_UCS4 ch)

   Comprueba si *ch* es un sustituto alto ("0xD800 <= ch <= 0xDFFF").

int Py_UNICODE_IS_LOW_SURROGATE(Py_UCS4 ch)

   Comprueba si *ch* es un sustituto bajo ("0xD800 <= ch <= 0xDFFF").

Py_UCS4 Py_UNICODE_JOIN_SURROGATES(Py_UCS4 high, Py_UCS4 low)

   Join two surrogate code points and return a single "Py_UCS4" value.
   *high* and *low* are respectively the leading and trailing
   surrogates in a surrogate pair. *high* must be in the range
   [0xD800; 0xDBFF] and *low* must be in the range [0xDC00; 0xDFFF].


Creando y accediendo a cadenas de caracteres Unicode
----------------------------------------------------

Para crear objetos Unicode y acceder a sus propiedades de secuencia
básicas, use estas API:

PyObject *PyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)
    *Return value: New reference.*

   Crea un nuevo objeto Unicode. *maxchar* debe ser el punto de código
   máximo que se colocará en la cadena de caracteres. Como una
   aproximación, se puede redondear al valor más cercano en la
   secuencia 127, 255, 65535, 1114111.

   On error, set an exception and return "NULL".

   After creation, the string can be filled by
   "PyUnicode_WriteChar()", "PyUnicode_CopyCharacters()",
   "PyUnicode_Fill()", "PyUnicode_WRITE()" or similar. Since strings
   are supposed to be immutable, take care to not “use” the result
   while it is being modified. In particular, before it's filled with
   its final contents, a string:

   * must not be hashed,

   * must not be "converted to UTF-8", or another non-"canonical"
     representation,

   * must not have its reference count changed,

   * must not be shared with code that might do one of the above.

   This list is not exhaustive. Avoiding these uses is your
   responsibility; Python does not always check these requirements.

   To avoid accidentally exposing a partially-written string object,
   prefer using the "PyUnicodeWriter" API, or one of the
   "PyUnicode_From*" functions below.

   Added in version 3.3.

PyObject *PyUnicode_FromKindAndData(int kind, const void *buffer, Py_ssize_t size)
    *Return value: New reference.*

   Crea un nuevo objeto Unicode con el tipo *kind* dado (los valores
   posibles son "PyUnicode_1BYTE_KIND" etc., según lo retornado por
   "PyUnicode_KIND()"). El *búfer* debe apuntar a un vector (*array*)
   de *tamaño* unidades de 1, 2 o 4 bytes por carácter, según el tipo.

   Si es necesario, la entrada *buffer* se copia y se transforma en la
   representación canónica. Por ejemplo, si el *buffer* es una cadena
   de caracteres UCS4 ("PyUnicode_4BYTE_KIND") y consta solo de puntos
   de código en el rango UCS1, se transformará en UCS1
   ("PyUnicode_1BYTE_KIND").

   Added in version 3.3.

PyObject *PyUnicode_FromStringAndSize(const char *str, Py_ssize_t size)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object from the char buffer *str*.  The bytes will
   be interpreted as being UTF-8 encoded.  The buffer is copied into
   the new object. The return value might be a shared object, i.e.
   modification of the data is not allowed.

   This function raises "SystemError" when:

   * *size* < 0,

   * *str* is "NULL" and *size* > 0

   Distinto en la versión 3.12: *str* == "NULL" with *size* > 0 is not
   allowed anymore.

PyObject *PyUnicode_FromString(const char *str)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object from a UTF-8 encoded null-terminated char
   buffer *str*.

PyObject *PyUnicode_FromFormat(const char *format, ...)
    *Return value: New reference.** Part of the Stable ABI.*

   Take a C "printf()"-style *format* string and a variable number of
   arguments, calculate the size of the resulting Python Unicode
   string and return a string with the values formatted into it.  The
   variable arguments must be C types and must correspond exactly to
   the format characters in the *format* ASCII-encoded string.

   A conversion specifier contains two or more characters and has the
   following components, which must occur in this order:

   1. The "'%'" character, which marks the start of the specifier.

   2. Conversion flags (optional), which affect the result of some
      conversion types.

   3. Minimum field width (optional). If specified as an "'*'"
      (asterisk), the actual width is given in the next argument,
      which must be of type int, and the object to convert comes after
      the minimum field width and optional precision.

   4. Precision (optional), given as a "'.'" (dot) followed by the
      precision. If specified as "'*'" (an asterisk), the actual
      precision is given in the next argument, which must be of type
      int, and the value to convert comes after the precision.

   5. Length modifier (optional).

   6. Conversion type.

   The conversion flag characters are:

   +---------+---------------------------------------------------------------+
   | Flag    | Meaning                                                       |
   |=========|===============================================================|
   | "0"     | The conversion will be zero padded for numeric values.        |
   +---------+---------------------------------------------------------------+
   | "-"     | The converted value is left adjusted (overrides the "0" flag  |
   |         | if both are given).                                           |
   +---------+---------------------------------------------------------------+

   The length modifiers for following integer conversions ("d", "i",
   "o", "u", "x", or "X") specify the type of the argument (int by
   default):

   +------------+-------------------------------------------------------+
   | Modifier   | Types                                                 |
   |============|=======================================================|
   | "l"        | long or unsigned long                                 |
   +------------+-------------------------------------------------------+
   | "ll"       | long long or unsigned long long                       |
   +------------+-------------------------------------------------------+
   | "j"        | "intmax_t" or "uintmax_t"                             |
   +------------+-------------------------------------------------------+
   | "z"        | "size_t" or "ssize_t"                                 |
   +------------+-------------------------------------------------------+
   | "t"        | "ptrdiff_t"                                           |
   +------------+-------------------------------------------------------+

   The length modifier "l" for following conversions "s" or "V"
   specify that the type of the argument is const wchar_t*.

   The conversion specifiers are:

   +-----------------------------------+-----------------------------------+-----------------------------------+
   | Conversion Specifier              | Tipo                              | Comentario                        |
   |===================================|===================================|===================================|
   | "%"                               | *n/a*                             | The literal "%" character.        |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "d", "i"                          | Specified by the length modifier  | The decimal representation of a   |
   |                                   |                                   | signed C integer.                 |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "u"                               | Specified by the length modifier  | The decimal representation of an  |
   |                                   |                                   | unsigned C integer.               |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "o"                               | Specified by the length modifier  | The octal representation of an    |
   |                                   |                                   | unsigned C integer.               |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "x"                               | Specified by the length modifier  | The hexadecimal representation of |
   |                                   |                                   | an unsigned C integer             |
   |                                   |                                   | (lowercase).                      |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "X"                               | Specified by the length modifier  | The hexadecimal representation of |
   |                                   |                                   | an unsigned C integer             |
   |                                   |                                   | (uppercase).                      |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "c"                               | int                               | A single character.               |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "s"                               | const char* or const wchar_t*     | Un arreglo de caracteres de C     |
   |                                   |                                   | terminada en nulo.                |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "p"                               | const void*                       | The hex representation of a C     |
   |                                   |                                   | pointer. Mostly equivalent to     |
   |                                   |                                   | "printf("%p")" except that it is  |
   |                                   |                                   | guaranteed to start with the      |
   |                                   |                                   | literal "0x" regardless of what   |
   |                                   |                                   | the platform's "printf" yields.   |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "A"                               | PyObject*                         | El resultado de llamar "ascii()". |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "U"                               | PyObject*                         | Un objeto unicode.                |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "V"                               | PyObject*, const char* or const   | Un objeto Unicode (que puede ser  |
   |                                   | wchar_t*                          | "NULL") y un arreglo de           |
   |                                   |                                   | caracteres de C terminada en nulo |
   |                                   |                                   | como segundo parámetro (que se    |
   |                                   |                                   | utilizará, si el primer parámetro |
   |                                   |                                   | es "NULL").                       |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "S"                               | PyObject*                         | El resultado de llamar            |
   |                                   |                                   | "PyObject_Str()".                 |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "R"                               | PyObject*                         | El resultado de llamar            |
   |                                   |                                   | "PyObject_Repr()".                |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "T"                               | PyObject*                         | Get the fully qualified name of   |
   |                                   |                                   | an object type; call              |
   |                                   |                                   | "PyType_GetFullyQualifiedName()". |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "#T"                              | PyObject*                         | Similar to "T" format, but use a  |
   |                                   |                                   | colon (":") as separator between  |
   |                                   |                                   | the module name and the qualified |
   |                                   |                                   | name.                             |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "N"                               | PyTypeObject*                     | Get the fully qualified name of a |
   |                                   |                                   | type; call                        |
   |                                   |                                   | "PyType_GetFullyQualifiedName()". |
   +-----------------------------------+-----------------------------------+-----------------------------------+
   | "#N"                              | PyTypeObject*                     | Similar to "N" format, but use a  |
   |                                   |                                   | colon (":") as separator between  |
   |                                   |                                   | the module name and the qualified |
   |                                   |                                   | name.                             |
   +-----------------------------------+-----------------------------------+-----------------------------------+

   Nota:

     The width formatter unit is number of characters rather than
     bytes. The precision formatter unit is number of bytes or
     "wchar_t" items (if the length modifier "l" is used) for ""%s""
     and ""%V"" (if the "PyObject*" argument is "NULL"), and a number
     of characters for ""%A"", ""%U"", ""%S"", ""%R"" and ""%V"" (if
     the "PyObject*" argument is not "NULL").

   Nota:

     Unlike to C "printf()" the "0" flag has effect even when a
     precision is given for integer conversions ("d", "i", "u", "o",
     "x", or "X").

   Distinto en la versión 3.2: Soporte agregado para ""%lld"" y
   ""%llu"".

   Distinto en la versión 3.3: Soporte agregado para ""%li"", ""%lli""
   y ""%zi"".

   Distinto en la versión 3.4: Soporte agregado para formateadores de
   anchura y precisión para ""%s"", ""%A"", ""%U"", ""%V"", ""%S"",
   ""%R"".

   Distinto en la versión 3.12: Support for conversion specifiers "o"
   and "X". Support for length modifiers "j" and "t". Length modifiers
   are now applied to all integer conversions. Length modifier "l" is
   now applied to conversion specifiers "s" and "V". Support for
   variable width and precision "*". Support for flag "-".An
   unrecognized format character now sets a "SystemError". In previous
   versions it caused all the rest of the format string to be copied
   as-is to the result string, and any extra arguments discarded.

   Distinto en la versión 3.13: Support for "%T", "%#T", "%N" and
   "%#N" formats added.

PyObject *PyUnicode_FromFormatV(const char *format, va_list vargs)
    *Return value: New reference.** Part of the Stable ABI.*

   Idéntico a "PyUnicode_FromFormat()" excepto que toma exactamente
   dos argumentos.

PyObject *PyUnicode_FromObject(PyObject *obj)
    *Return value: New reference.** Part of the Stable ABI.*

   Copy an instance of a Unicode subtype to a new true Unicode object
   if necessary. If *obj* is already a true Unicode object (not a
   subtype), return a new *strong reference* to the object.

   Los objetos que no sean Unicode o sus subtipos causarán un
   "TypeError".

PyObject *PyUnicode_FromOrdinal(int ordinal)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode Object from the given Unicode code point
   *ordinal*.

   The ordinal must be in "range(0x110000)". A "ValueError" is raised
   in the case it is not.

PyObject *PyUnicode_FromEncodedObject(PyObject *obj, const char *encoding, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Decodifica un objeto codificado *obj* en un objeto Unicode.

   "bytes", "bytearray" y otros *los objetos similares a bytes* se
   decodifican de acuerdo con el *encoding* dado y utilizan el manejo
   de errores definido por *errors*. Ambos pueden ser "NULL" para que
   la interfaz use los valores predeterminados (ver Códecs
   incorporados para más detalles).

   Todos los demás objetos, incluidos los objetos Unicode, hacen que
   se establezca un "TypeError".

   La API retorna "NULL" si hubo un error. La entidad que hace la
   llamadas es la responsable de desreferenciar los objetos
   retornados.

void PyUnicode_Append(PyObject **p_left, PyObject *right)
    * Part of the Stable ABI.*

   Append the string *right* to the end of *p_left*. *p_left* must
   point to a *strong reference* to a Unicode object;
   "PyUnicode_Append()" releases ("steals") this reference.

   On error, set **p_left* to "NULL" and set an exception.

   On success, set **p_left* to a new strong reference to the result.

void PyUnicode_AppendAndDel(PyObject **p_left, PyObject *right)
    * Part of the Stable ABI.*

   The function is similar to "PyUnicode_Append()", with the only
   difference being that it decrements the reference count of *right*
   by one.

PyObject *PyUnicode_BuildEncodingMap(PyObject *string)
    *Return value: New reference.** Part of the Stable ABI.*

   Return a mapping suitable for decoding a custom single-byte
   encoding. Given a Unicode string *string* of up to 256 characters
   representing an encoding table, returns either a compact internal
   mapping object or a dictionary mapping character ordinals to byte
   values. Raises a "TypeError" and return "NULL" on invalid input.

   Added in version 3.2.

const char *PyUnicode_GetDefaultEncoding(void)
    * Part of the Stable ABI.*

   Return the name of the default string encoding, ""utf-8"". See
   "sys.getdefaultencoding()".

   The returned string does not need to be freed, and is valid until
   interpreter shutdown.

Py_ssize_t PyUnicode_GetLength(PyObject *unicode)
    * Part of the Stable ABI since version 3.7.*

   Retorna la longitud del objeto Unicode, en puntos de código.

   On error, set an exception and return "-1".

   Added in version 3.3.

Py_ssize_t PyUnicode_CopyCharacters(PyObject *to, Py_ssize_t to_start, PyObject *from, Py_ssize_t from_start, Py_ssize_t how_many)

   Copy characters from one Unicode object into another.  This
   function performs character conversion when necessary and falls
   back to "memcpy()" if possible.  Returns "-1" and sets an exception
   on error, otherwise returns the number of copied characters.

   The string must not have been “used” yet. See "PyUnicode_New()" for
   details.

   Added in version 3.3.

int PyUnicode_Resize(PyObject **unicode, Py_ssize_t length);
    * Part of the Stable ABI.*

   Resize a Unicode object **unicode* to the new *length* in code
   points.

   Try to resize the string in place (which is usually faster than
   allocating a new string and copying characters), or create a new
   string.

   **unicode* is modified to point to the new (resized) object and "0"
   is returned on success. Otherwise, "-1" is returned and an
   exception is set, and **unicode* is left untouched.

   The function doesn't check string content, the result may not be a
   string in canonical representation.

Py_ssize_t PyUnicode_Fill(PyObject *unicode, Py_ssize_t start, Py_ssize_t length, Py_UCS4 fill_char)

   Rellena una cadena con un carácter: escriba *fill_char* en
   "unicode[inicio:inicio+longitud]".

   Falla si *fill_char* es más grande que el carácter máximo de la
   cadena, o si la cadena tiene más de 1 referencia.

   The string must not have been “used” yet. See "PyUnicode_New()" for
   details.

   Retorna el número de caracteres escritos o retorna "-1" y lanza una
   excepción en caso de error.

   Added in version 3.3.

int PyUnicode_WriteChar(PyObject *unicode, Py_ssize_t index, Py_UCS4 character)
    * Part of the Stable ABI since version 3.7.*

   Write a *character* to the string *unicode* at the zero-based
   *index*. Return "0" on success, "-1" on error with an exception
   set.

   This function checks that *unicode* is a Unicode object, that the
   index is not out of bounds, and that the object's reference count
   is one. See "PyUnicode_WRITE()" for a version that skips these
   checks, making them your responsibility.

   The string must not have been “used” yet. See "PyUnicode_New()" for
   details.

   Added in version 3.3.

Py_UCS4 PyUnicode_ReadChar(PyObject *unicode, Py_ssize_t index)
    * Part of the Stable ABI since version 3.7.*

   Read a character from a string.  This function checks that
   *unicode* is a Unicode object and the index is not out of bounds,
   in contrast to "PyUnicode_READ_CHAR()", which performs no error
   checking.

   Return character on success, "-1" on error with an exception set.

   Added in version 3.3.

PyObject *PyUnicode_Substring(PyObject *unicode, Py_ssize_t start, Py_ssize_t end)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.7.*

   Return a substring of *unicode*, from character index *start*
   (included) to character index *end* (excluded).  Negative indices
   are not supported. On error, set an exception and return "NULL".

   Added in version 3.3.

Py_UCS4 *PyUnicode_AsUCS4(PyObject *unicode, Py_UCS4 *buffer, Py_ssize_t buflen, int copy_null)
    * Part of the Stable ABI since version 3.7.*

   Copy the string *unicode* into a UCS4 buffer, including a null
   character, if *copy_null* is set.  Returns "NULL" and sets an
   exception on error (in particular, a "SystemError" if *buflen* is
   smaller than the length of *unicode*).  *buffer* is returned on
   success.

   Added in version 3.3.

Py_UCS4 *PyUnicode_AsUCS4Copy(PyObject *unicode)
    * Part of the Stable ABI since version 3.7.*

   Copy the string *unicode* into a new UCS4 buffer that is allocated
   using "PyMem_Malloc()".  If this fails, "NULL" is returned with a
   "MemoryError" set.  The returned buffer always has an extra null
   code point appended.

   Added in version 3.3.


Codificación regional
---------------------

La codificación local actual se puede utilizar para decodificar texto
del sistema operativo.

PyObject *PyUnicode_DecodeLocaleAndSize(const char *str, Py_ssize_t length, const char *errors)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.7.*

   Decodifica una cadena de caracteres UTF-8 en Android y VxWorks, o
   de la codificación de configuración regional actual en otras
   plataformas. Los manejadores de errores admitidos son ""estricto""
   y ""subrogateescape"" (**PEP 383**). El decodificador usa el
   controlador de errores ""estricto"" si *errors* es "NULL". *str*
   debe terminar con un carácter nulo pero no puede contener
   caracteres nulos incrustados.

   Use "PyUnicode_DecodeFSDefaultAndSize()" to decode a string from
   the *filesystem encoding and error handler*.

   Esta función ignora el modo Python UTF-8.

   Ver también: La función "Py_DecodeLocale()".

   Added in version 3.3.

   Distinto en la versión 3.7: La función ahora también usa la
   codificación de configuración regional actual para el controlador
   de errores "subrogateescape", excepto en Android. Anteriormente,
   "Py_DecodeLocale()" se usaba para el "subrogateescape", y la
   codificación local actual se usaba para "estricto".

PyObject *PyUnicode_DecodeLocale(const char *str, const char *errors)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.7.*

   Similar to "PyUnicode_DecodeLocaleAndSize()", but compute the
   string length using "strlen()".

   Added in version 3.3.

PyObject *PyUnicode_EncodeLocale(PyObject *unicode, const char *errors)
    *Return value: New reference.** Part of the Stable ABI since
   version 3.7.*

   Codifica un objeto Unicode UTF-8 en Android y VxWorks, o en la
   codificación local actual en otras plataformas. Los manejadores de
   errores admitidos son ""estricto"" y ""subrogateescape"" (**PEP
   383**). El codificador utiliza el controlador de errores
   ""estricto"" si *errors* es "NULL". Retorna un objeto "bytes".
   *unicode* no puede contener caracteres nulos incrustados.

   Use "PyUnicode_EncodeFSDefault()" to encode a string to the
   *filesystem encoding and error handler*.

   Esta función ignora el modo Python UTF-8.

   Ver también: La función "Py_EncodeLocale()".

   Added in version 3.3.

   Distinto en la versión 3.7: La función ahora también usa la
   codificación de configuración regional actual para el controlador
   de errores "subrogateescape", excepto en Android. Anteriormente,
   "Py_EncodeLocale()" se usaba para el "subrogateescape", y la
   codificación local actual se usaba para "estricto".


Codificación del sistema de archivos
------------------------------------

Functions encoding to and decoding from the *filesystem encoding and
error handler* (**PEP 383** and **PEP 529**).

To encode file names to "bytes" during argument parsing, the ""O&""
converter should be used, passing "PyUnicode_FSConverter()" as the
conversion function:

int PyUnicode_FSConverter(PyObject *obj, void *result)
    * Part of the Stable ABI.*

   PyArg_Parse* converter: encode "str" objects -- obtained directly
   or through the "os.PathLike" interface -- to "bytes" using
   "PyUnicode_EncodeFSDefault()"; "bytes" objects are output as-is.
   *result* must be an address of a C variable of type PyObject* (or
   PyBytesObject*). On success, set the variable to a new *strong
   reference* to a bytes object which must be released when it is no
   longer used and return a non-zero value ("Py_CLEANUP_SUPPORTED").
   Embedded null bytes are not allowed in the result. On failure,
   return "0" with an exception set.

   If *obj* is "NULL", the function releases a strong reference stored
   in the variable referred by *result* and returns "1".

   Added in version 3.1.

   Distinto en la versión 3.6: Acepta un objeto similar a una ruta
   (*path-like object*).

To decode file names to "str" during argument parsing, the ""O&""
converter should be used, passing "PyUnicode_FSDecoder()" as the
conversion function:

int PyUnicode_FSDecoder(PyObject *obj, void *result)
    * Part of the Stable ABI.*

   PyArg_Parse* converter: decode "bytes" objects -- obtained either
   directly or indirectly through the "os.PathLike" interface -- to
   "str" using "PyUnicode_DecodeFSDefaultAndSize()"; "str" objects are
   output as-is. *result* must be an address of a C variable of type
   PyObject* (or PyUnicodeObject*). On success, set the variable to a
   new *strong reference* to a Unicode object which must be released
   when it is no longer used and return a non-zero value
   ("Py_CLEANUP_SUPPORTED"). Embedded null characters are not allowed
   in the result. On failure, return "0" with an exception set.

   If *obj* is "NULL", release the strong reference to the object
   referred to by *result* and return "1".

   Added in version 3.2.

   Distinto en la versión 3.6: Acepta un objeto similar a una ruta
   (*path-like object*).

PyObject *PyUnicode_DecodeFSDefaultAndSize(const char *str, Py_ssize_t size)
    *Return value: New reference.** Part of the Stable ABI.*

   Decodifica una cadena desde el *codificador de sistema de archivos
   y gestor de errores*.

   If you need to decode a string from the current locale encoding,
   use "PyUnicode_DecodeLocaleAndSize()".

   Ver también: La función "Py_DecodeLocale()".

   Distinto en la versión 3.6: The *filesystem error handler* is now
   used.

PyObject *PyUnicode_DecodeFSDefault(const char *str)
    *Return value: New reference.** Part of the Stable ABI.*

   Decodifica una cadena terminada en nulo desde el *codificador de
   sistema de archivos y gestor de errores*.

   If the string length is known, use
   "PyUnicode_DecodeFSDefaultAndSize()".

   Distinto en la versión 3.6: The *filesystem error handler* is now
   used.

PyObject *PyUnicode_EncodeFSDefault(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Encode a Unicode object to the *filesystem encoding and error
   handler*, and return "bytes". Note that the resulting "bytes"
   object can contain null bytes.

   If you need to encode a string to the current locale encoding, use
   "PyUnicode_EncodeLocale()".

   Ver también: La función "Py_EncodeLocale()".

   Added in version 3.2.

   Distinto en la versión 3.6: The *filesystem error handler* is now
   used.


soporte wchar_t
---------------

"wchar_t" support for platforms which support it:

PyObject *PyUnicode_FromWideChar(const wchar_t *wstr, Py_ssize_t size)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object from the "wchar_t" buffer *wstr* of the
   given *size*. Passing "-1" as the *size* indicates that the
   function must itself compute the length, using "wcslen()". Return
   "NULL" on failure.

Py_ssize_t PyUnicode_AsWideChar(PyObject *unicode, wchar_t *wstr, Py_ssize_t size)
    * Part of the Stable ABI.*

   Copy the Unicode object contents into the "wchar_t" buffer *wstr*.
   At most *size* "wchar_t" characters are copied (excluding a
   possibly trailing null termination character).  Return the number
   of "wchar_t" characters copied or "-1" in case of an error.

   When *wstr* is "NULL", instead return the *size* that would be
   required to store all of *unicode* including a terminating null.

   Note that the resulting wchar_t* string may or may not be null-
   terminated.  It is the responsibility of the caller to make sure
   that the wchar_t* string is null-terminated in case this is
   required by the application. Also, note that the wchar_t* string
   might contain null characters, which would cause the string to be
   truncated when used with most C functions.

wchar_t *PyUnicode_AsWideCharString(PyObject *unicode, Py_ssize_t *size)
    * Part of the Stable ABI since version 3.7.*

   Convert the Unicode object to a wide character string. The output
   string always ends with a null character. If *size* is not "NULL",
   write the number of wide characters (excluding the trailing null
   termination character) into **size*. Note that the resulting
   "wchar_t" string might contain null characters, which would cause
   the string to be truncated when used with most C functions. If
   *size* is "NULL" and the wchar_t* string contains null characters a
   "ValueError" is raised.

   Returns a buffer allocated by "PyMem_New" (use "PyMem_Free()" to
   free it) on success. On error, returns "NULL" and **size* is
   undefined. Raises a "MemoryError" if memory allocation is failed.

   Added in version 3.2.

   Distinto en la versión 3.7: Raises a "ValueError" if *size* is
   "NULL" and the wchar_t* string contains null characters.


Códecs incorporados
===================

Python proporciona un conjunto de códecs integrados que están escritos
en C para mayor velocidad. Todos estos códecs se pueden usar
directamente a través de las siguientes funciones.

Muchas de las siguientes API toman dos argumentos de *encoding* y
*errors*, y tienen la misma semántica que las del constructor de
objetos de cadena incorporado "str()".

Setting encoding to "NULL" causes the default encoding to be used
which is UTF-8.  The file system calls should use
"PyUnicode_FSConverter()" for encoding file names. This uses the
*filesystem encoding and error handler* internally.

El manejo de errores se establece mediante *errors* que también pueden
establecerse en "NULL", lo que significa usar el manejo predeterminado
definido para el códec. El manejo de errores predeterminado para todos
los códecs integrados es "estricto" (se lanza "ValueError").

The codecs all use a similar interface.  Only deviations from the
following generic ones are documented for simplicity.


Códecs genéricos
----------------

The following macro is provided:

Py_UNICODE_REPLACEMENT_CHARACTER

   The Unicode code point "U+FFFD" (replacement character).

   This Unicode character is used as the replacement character during
   decoding if the *errors* argument is set to "replace".

Estas son las APIs de códecs genéricos:

PyObject *PyUnicode_Decode(const char *str, Py_ssize_t size, const char *encoding, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the encoded
   string *str*. *encoding* and *errors* have the same meaning as the
   parameters of the same name in the "str()" built-in function.  The
   codec to be used is looked up using the Python codec registry.
   Return "NULL" if an exception was raised by the codec.

PyObject *PyUnicode_AsEncodedString(PyObject *unicode, const char *encoding, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode y retorna el resultado como un objeto de
   bytes de Python. *encoding* y *errors* tienen el mismo significado
   que los parámetros del mismo nombre en el método Unicode
   "encode()". El códec que se utilizará se busca utilizando el
   registro de códec Python. Retorna "NULL" si el códec provocó una
   excepción.


Códecs UTF-8
------------

Estas son las APIs del códec UTF-8:

PyObject *PyUnicode_DecodeUTF8(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the UTF-8
   encoded string *str*. Return "NULL" if an exception was raised by
   the codec.

PyObject *PyUnicode_DecodeUTF8Stateful(const char *str, Py_ssize_t size, const char *errors, Py_ssize_t *consumed)
    *Return value: New reference.** Part of the Stable ABI.*

   Si *consumed* es "NULL", se comporta como "PyUnicode_DecodeUTF8()".
   Si *consumed* no es "NULL", las secuencias de bytes UTF-8
   incompletas no se tratarán como un error. Esos bytes no serán
   decodificados y la cantidad de bytes que han sido decodificados se
   almacenará en *consumed*.

PyObject *PyUnicode_AsUTF8String(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode usando UTF-8 y retorna el resultado como
   un objeto de bytes de Python. El manejo de errores es "estricto".
   Retorna "NULL" si el códec provocó una excepción.

   The function fails if the string contains surrogate code points
   ("U+D800" - "U+DFFF").

const char *PyUnicode_AsUTF8AndSize(PyObject *unicode, Py_ssize_t *size)
    * Part of the Stable ABI since version 3.10.*

   Retorna un puntero a la codificación UTF-8 del objeto Unicode y
   almacena el tamaño de la representación codificada (en bytes) en
   *size*. El argumento *size* puede ser "NULL"; en este caso no se
   almacenará el tamaño. El búfer retornado siempre tiene un byte nulo
   adicional agregado (no incluido en *size*), independientemente de
   si hay otros puntos de código nulo.

   On error, set an exception, set *size* to "-1" (if it's not NULL)
   and return "NULL".

   The function fails if the string contains surrogate code points
   ("U+D800" - "U+DFFF").

   This caches the UTF-8 representation of the string in the Unicode
   object, and subsequent calls will return a pointer to the same
   buffer.  The caller is not responsible for deallocating the buffer.
   The buffer is deallocated and pointers to it become invalid when
   the Unicode object is garbage collected.

   Added in version 3.3.

   Distinto en la versión 3.7: El tipo de retorno ahora es "const char
   *" en lugar de "char *".

   Distinto en la versión 3.10: This function is a part of the limited
   API.

const char *PyUnicode_AsUTF8(PyObject *unicode)

   Como "PyUnicode_AsUTF8AndSize()", pero no almacena el tamaño.

   Advertencia:

     This function does not have any special behavior for null
     characters embedded within *unicode*. As a result, strings
     containing null characters will remain in the returned string,
     which some C functions might interpret as the end of the string,
     leading to truncation. If truncation is an issue, it is
     recommended to use "PyUnicode_AsUTF8AndSize()" instead.

   Added in version 3.3.

   Distinto en la versión 3.7: El tipo de retorno ahora es "const char
   *" en lugar de "char *".


Códecs UTF-32
-------------

Estas son las APIs de códecs para UTF-32:

PyObject *PyUnicode_DecodeUTF32(const char *str, Py_ssize_t size, const char *errors, int *byteorder)
    *Return value: New reference.** Part of the Stable ABI.*

   Decodifica *size* bytes de una cadena de búfer codificada UTF-32 y
   retorna el objeto Unicode correspondiente. *errors* (si no es
   "NULL") define el manejo de errores. Su valor predeterminado es
   "estricto".

   Si *byteorder* no es "NULL", el decodificador comienza a
   decodificar utilizando el orden de bytes dado:

      *byteorder == -1: little endian
      *byteorder == 0:  native order
      *byteorder == 1:  big endian

   Si "*byteorder" es cero, y los primeros cuatro bytes de los datos
   de entrada son una marca de orden de bytes (BOM), el decodificador
   cambia a este orden de bytes y la BOM no se copia en la cadena de
   caracteres Unicode resultante. Si "*byteorder" es "-1" o "1",
   cualquier marca de orden de bytes se copia en la salida.

   Una vez completado, **byteorder* se establece en el orden de bytes
   actual al final de los datos de entrada.

   Si *byteorder* es "NULL", el códec se inicia en modo de orden
   nativo.

   Retorna "NULL" si el códec provocó una excepción.

PyObject *PyUnicode_DecodeUTF32Stateful(const char *str, Py_ssize_t size, const char *errors, int *byteorder, Py_ssize_t *consumed)
    *Return value: New reference.** Part of the Stable ABI.*

   Si *consumed* es "NULL", se comporta como
   "PyUnicode_DecodeUTF32()". Si *consumed* no es "NULL",
   "PyUnicode_DecodeUTF32Stateful()" no tratará las secuencias de
   bytes UTF-32 incompletas finales (como un número de bytes no
   divisible por cuatro) como un error. Esos bytes no serán
   decodificados y la cantidad de bytes que han sido decodificados se
   almacenará en *consumed*.

PyObject *PyUnicode_AsUTF32String(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Retorna una cadena de bytes de Python usando la codificación UTF-32
   en orden de bytes nativo. La cadena siempre comienza con una marca
   BOM. El manejo de errores es "estricto". Retorna "NULL" si el códec
   provocó una excepción.


Códecs UTF-16
-------------

Estas son las APIs de códecs para UTF-16:

PyObject *PyUnicode_DecodeUTF16(const char *str, Py_ssize_t size, const char *errors, int *byteorder)
    *Return value: New reference.** Part of the Stable ABI.*

   Decodifica *size* bytes de una cadena de caracteres de búfer
   codificada UTF-16 y retorna el objeto Unicode correspondiente.
   *errors* (si no es "NULL") define el manejo de errores. Su valor
   predeterminado es "estricto".

   Si *byteorder* no es "NULL", el decodificador comienza a
   decodificar utilizando el orden de bytes dado:

      *byteorder == -1: little endian
      *byteorder == 0:  native order
      *byteorder == 1:  big endian

   Si "*byteorder" es cero, y los primeros dos bytes de los datos de
   entrada son una marca de orden de bytes (BOM), el decodificador
   cambia a este orden de bytes y la BOM no se copia en la cadena de
   caracteres Unicode resultante. Si "*byteorder" es "-1" o "1",
   cualquier marca de orden de bytes se copia en la salida (donde dará
   como resultado un "\ufeff" o un carácter "\ufffe").

   After completion, "*byteorder" is set to the current byte order at
   the end of input data.

   Si *byteorder* es "NULL", el códec se inicia en modo de orden
   nativo.

   Retorna "NULL" si el códec provocó una excepción.

PyObject *PyUnicode_DecodeUTF16Stateful(const char *str, Py_ssize_t size, const char *errors, int *byteorder, Py_ssize_t *consumed)
    *Return value: New reference.** Part of the Stable ABI.*

   Si *consumed* es "NULL", se comporta como
   "PyUnicode_DecodeUTF16()". Si *consumed* no es "NULL",
   "PyUnicode_DecodeUTF16Stateful()" no tratará las secuencias de
   bytes UTF-16 incompletas finales (como un número impar de bytes o
   un par sustituto dividido) como un error. Esos bytes no serán
   decodificados y la cantidad de bytes que han sido decodificados se
   almacenará en *consumed*.

PyObject *PyUnicode_AsUTF16String(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Retorna una cadena de bytes de Python usando la codificación UTF-16
   en orden de bytes nativo. La cadena siempre comienza con una marca
   BOM. El manejo de errores es "estricto". Retorna "NULL" si el códec
   provocó una excepción.


Códecs UTF-7
------------

Estas son las APIs del códec UTF-7:

PyObject *PyUnicode_DecodeUTF7(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the UTF-7
   encoded string *str*.  Return "NULL" if an exception was raised by
   the codec.

PyObject *PyUnicode_DecodeUTF7Stateful(const char *str, Py_ssize_t size, const char *errors, Py_ssize_t *consumed)
    *Return value: New reference.** Part of the Stable ABI.*

   Si *consumed* es "NULL", se comporta como "PyUnicode_DecodeUTF7()".
   Si *consumed* no es "NULL", las secciones UTF-7 base-64 incompletas
   no se tratarán como un error. Esos bytes no serán decodificados y
   la cantidad de bytes que han sido decodificados se almacenará en
   *consumed*.


Códecs Unicode escapado
-----------------------

Estas son las APIs de códecs para Unicode escapado:

PyObject *PyUnicode_DecodeUnicodeEscape(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the Unicode-
   Escape encoded string *str*.  Return "NULL" if an exception was
   raised by the codec.

PyObject *PyUnicode_AsUnicodeEscapeString(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode usando Unicode escapado (*Unicode-
   Escape*) y retorna el resultado como un objeto de bytes. El manejo
   de errores es "estricto". Retorna "NULL" si el códec provocó una
   excepción.


Códecs para Unicode escapado en bruto
-------------------------------------

Estas son las API del códec Unicode escapado en bruto (*Raw Unicode
Escape*):

PyObject *PyUnicode_DecodeRawUnicodeEscape(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the Raw-
   Unicode-Escape encoded string *str*.  Return "NULL" if an exception
   was raised by the codec.

PyObject *PyUnicode_AsRawUnicodeEscapeString(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode usando Unicode escapado en bruto (*Raw-
   Unicode-Escape*) y retorna el resultado como un objeto de bytes. El
   manejo de errores es "estricto". Retorna "NULL" si el códec provocó
   una excepción.


Códecs Latin-1
--------------

Estas son las API del códec Latin-1: Latin-1 corresponde a los
primeros 256 ordinales Unicode y solo estos son aceptados por los
códecs durante la codificación.

PyObject *PyUnicode_DecodeLatin1(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the Latin-1
   encoded string *str*.  Return "NULL" if an exception was raised by
   the codec.

PyObject *PyUnicode_AsLatin1String(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode usando Latin-1 y retorna el resultado
   como un objeto de bytes Python. El manejo de errores es "estricto".
   Retorna "NULL" si el códec provocó una excepción.


Códecs ASCII
------------

Estas son las API del códec ASCII. Solo se aceptan datos ASCII de 7
bits. Todos los demás códigos generan errores.

PyObject *PyUnicode_DecodeASCII(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the ASCII
   encoded string *str*.  Return "NULL" if an exception was raised by
   the codec.

PyObject *PyUnicode_AsASCIIString(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode usando ASCII y retorna el resultado como
   un objeto de bytes de Python. El manejo de errores es "estricto".
   Retorna "NULL" si el códec provocó una excepción.


Códecs de mapa de caracteres
----------------------------

This codec is special in that it can be used to implement many
different codecs (and this is in fact what was done to obtain most of
the standard codecs included in the "encodings" package). The codec
uses mappings to encode and decode characters.  The mapping objects
provided must support the "__getitem__()" mapping interface;
dictionaries and sequences work well.

Estos son las API de códec de mapeo:

PyObject *PyUnicode_DecodeCharmap(const char *str, Py_ssize_t length, PyObject *mapping, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Create a Unicode object by decoding *size* bytes of the encoded
   string *str* using the given *mapping* object.  Return "NULL" if an
   exception was raised by the codec.

   Si *mapping* es "NULL", se aplicará la decodificación Latin-1. De
   lo contrario, *mapping* debe asignar bytes ordinales (enteros en el
   rango de 0 a 255) a cadenas de caracteres Unicode, enteros (que
   luego se interpretan como ordinales Unicode) o "None". Los bytes de
   datos sin asignar - los que causan un "LookupError", así como los
   que se asignan a "None", "0xFFFE" o "'\ ufffe'", se tratan como
   asignaciones indefinidas y causan un error.

PyObject *PyUnicode_AsCharmapString(PyObject *unicode, PyObject *mapping)
    *Return value: New reference.** Part of the Stable ABI.*

   Codifica un objeto Unicode usando el objeto *mapping* dado y
   retorna el resultado como un objeto de bytes. El manejo de errores
   es "estricto". Retorna "NULL" si el códec provocó una excepción.

   El objeto *mapping* debe asignar enteros ordinales Unicode a
   objetos de bytes, enteros en el rango de 0 a 255 o "None". Los
   ordinales de caracteres no asignados (los que causan un
   "LookupError"), así como los asignados a "Ninguno", se tratan como
   "mapeo indefinido" y causan un error.

La siguiente API de códec es especial en que asigna Unicode a Unicode.

PyObject *PyUnicode_Translate(PyObject *unicode, PyObject *table, const char *errors)
    *Return value: New reference.** Part of the Stable ABI.*

   Traduce una cadena de caracteres aplicando una tabla de mapeo y
   retornando  el objeto Unicode resultante. Retorna "NULL" cuando el
   códec provocó una excepción.

   La tabla de mapeo debe mapear enteros ordinales Unicode a enteros
   ordinales Unicode o "None" (causando la eliminación del carácter).

   Mapping tables need only provide the "__getitem__()" interface;
   dictionaries and sequences work well.  Unmapped character ordinals
   (ones which cause a "LookupError") are left untouched and are
   copied as-is.

   *errors* tiene el significado habitual para los códecs. Puede ser
   "NULL", lo que indica que debe usar el manejo de errores
   predeterminado.


Códecs MBCS para Windows
------------------------

Estas son las API de códec MBCS. Actualmente solo están disponibles en
Windows y utilizan los convertidores Win32 MBCS para implementar las
conversiones. Tenga en cuenta que MBCS (o DBCS) es una clase de
codificaciones, no solo una. La codificación de destino está definida
por la configuración del usuario en la máquina que ejecuta el códec.

PyObject *PyUnicode_DecodeMBCS(const char *str, Py_ssize_t size, const char *errors)
    *Return value: New reference.** Part of the Stable ABI on Windows
   since version 3.7.*

   Create a Unicode object by decoding *size* bytes of the MBCS
   encoded string *str*. Return "NULL" if an exception was raised by
   the codec.

PyObject *PyUnicode_DecodeMBCSStateful(const char *str, Py_ssize_t size, const char *errors, Py_ssize_t *consumed)
    *Return value: New reference.** Part of the Stable ABI on Windows
   since version 3.7.*

   Si *consumed* es "NULL", se comporta como "PyUnicode_DecodeMBCS()".
   Si *consumed* no es "NULL", "PyUnicode_DecodeMBCSStateful()" no
   decodificará el byte inicial y el número de bytes que se han
   decodificado se almacenará en *consumed*.

PyObject *PyUnicode_DecodeCodePageStateful(int code_page, const char *str, Py_ssize_t size, const char *errors, Py_ssize_t *consumed)
    *Return value: New reference.** Part of the Stable ABI on Windows
   since version 3.7.*

   Similar to "PyUnicode_DecodeMBCSStateful()", except uses the code
   page specified by *code_page*.

PyObject *PyUnicode_AsMBCSString(PyObject *unicode)
    *Return value: New reference.** Part of the Stable ABI on Windows
   since version 3.7.*

   Codifica un objeto Unicode usando MBCS y retorna el resultado como
   un objeto de bytes de Python. El manejo de errores es "estricto".
   Retorna "NULL" si el códec provocó una excepción.

PyObject *PyUnicode_EncodeCodePage(int code_page, PyObject *unicode, const char *errors)
    *Return value: New reference.** Part of the Stable ABI on Windows
   since version 3.7.*

   Encode the Unicode object using the specified code page and return
   a Python bytes object.  Return "NULL" if an exception was raised by
   the codec. Use "CP_ACP" code page to get the MBCS encoder.

   Added in version 3.3.


Métodos y funciones de ranura (*Slot*)
======================================

Las siguientes API son capaces de manejar objetos Unicode y cadenas de
caracteres en la entrada (nos referimos a ellos como cadenas de
caracteres en las descripciones) y retorna objetos Unicode o enteros
según corresponda.

Todos retornan "NULL" o "-1" si ocurre una excepción.

PyObject *PyUnicode_Concat(PyObject *left, PyObject *right)
    *Return value: New reference.** Part of the Stable ABI.*

   Une dos cadenas de caracteres que dan una nueva cadena de
   caracteres Unicode.

PyObject *PyUnicode_Split(PyObject *unicode, PyObject *sep, Py_ssize_t maxsplit)
    *Return value: New reference.** Part of the Stable ABI.*

   Divide una cadena de caracteres dando una lista de cadenas de
   caracteres Unicode. Si *sep* es "NULL", la división se realizará en
   todas las subcadenas de espacios en blanco. De lo contrario, las
   divisiones ocurren en el separador dado. A lo sumo se realizarán
   *maxsplit* divisiones. Si es negativo, no se establece ningún
   límite. Los separadores no están incluidos en la lista resultante.

   On error, return "NULL" with an exception set.

   Equivalent to "str.split()".

PyObject *PyUnicode_RSplit(PyObject *unicode, PyObject *sep, Py_ssize_t maxsplit)
    *Return value: New reference.** Part of the Stable ABI.*

   Similar to "PyUnicode_Split()", but splitting will be done
   beginning at the end of the string.

   On error, return "NULL" with an exception set.

   Equivalent to "str.rsplit()".

PyObject *PyUnicode_Splitlines(PyObject *unicode, int keepends)
    *Return value: New reference.** Part of the Stable ABI.*

   Split a Unicode string at line breaks, returning a list of Unicode
   strings. CRLF is considered to be one line break.  If *keepends* is
   "0", the Line break characters are not included in the resulting
   strings.

PyObject *PyUnicode_Partition(PyObject *unicode, PyObject *sep)
    *Return value: New reference.** Part of the Stable ABI.*

   Split a Unicode string at the first occurrence of *sep*, and return
   a 3-tuple containing the part before the separator, the separator
   itself, and the part after the separator. If the separator is not
   found, return a 3-tuple containing the string itself, followed by
   two empty strings.

   *sep* must not be empty.

   On error, return "NULL" with an exception set.

   Equivalent to "str.partition()".

PyObject *PyUnicode_RPartition(PyObject *unicode, PyObject *sep)
    *Return value: New reference.** Part of the Stable ABI.*

   Similar to "PyUnicode_Partition()", but split a Unicode string at
   the last occurrence of *sep*. If the separator is not found, return
   a 3-tuple containing two empty strings, followed by the string
   itself.

   *sep* must not be empty.

   On error, return "NULL" with an exception set.

   Equivalent to "str.rpartition()".

PyObject *PyUnicode_Join(PyObject *separator, PyObject *seq)
    *Return value: New reference.** Part of the Stable ABI.*

   Une una secuencia de cadenas de caracteres usando el *separator*
   dado y retorna la cadena de caracteres Unicode resultante.

Py_ssize_t PyUnicode_Tailmatch(PyObject *unicode, PyObject *substr, Py_ssize_t start, Py_ssize_t end, int direction)
    * Part of the Stable ABI.*

   Return "1" if *substr* matches "unicode[start:end]" at the given
   tail end (*direction* == "-1" means to do a prefix match,
   *direction* == "1" a suffix match), "0" otherwise. Return "-1" if
   an error occurred.

Py_ssize_t PyUnicode_Find(PyObject *unicode, PyObject *substr, Py_ssize_t start, Py_ssize_t end, int direction)
    * Part of the Stable ABI.*

   Return the first position of *substr* in "unicode[start:end]" using
   the given *direction* (*direction* == "1" means to do a forward
   search, *direction* == "-1" a backward search).  The return value
   is the index of the first match; a value of "-1" indicates that no
   match was found, and "-2" indicates that an error occurred and an
   exception has been set.

Py_ssize_t PyUnicode_FindChar(PyObject *unicode, Py_UCS4 ch, Py_ssize_t start, Py_ssize_t end, int direction)
    * Part of the Stable ABI since version 3.7.*

   Return the first position of the character *ch* in
   "unicode[start:end]" using the given *direction* (*direction* ==
   "1" means to do a forward search, *direction* == "-1" a backward
   search).  The return value is the index of the first match; a value
   of "-1" indicates that no match was found, and "-2" indicates that
   an error occurred and an exception has been set.

   Added in version 3.3.

   Distinto en la versión 3.7: *start* and *end* are now adjusted to
   behave like "unicode[start:end]".

Py_ssize_t PyUnicode_Count(PyObject *unicode, PyObject *substr, Py_ssize_t start, Py_ssize_t end)
    * Part of the Stable ABI.*

   Return the number of non-overlapping occurrences of *substr* in
   "unicode[start:end]".  Return "-1" if an error occurred.

PyObject *PyUnicode_Replace(PyObject *unicode, PyObject *substr, PyObject *replstr, Py_ssize_t maxcount)
    *Return value: New reference.** Part of the Stable ABI.*

   Replace at most *maxcount* occurrences of *substr* in *unicode*
   with *replstr* and return the resulting Unicode object. *maxcount*
   == "-1" means replace all occurrences.

int PyUnicode_Compare(PyObject *left, PyObject *right)
    * Part of the Stable ABI.*

   Compara dos cadenas de caracteres y retorna "-1", "0", "1" para
   menor que, igual y mayor que, respectivamente.

   Esta función retorna "-1" en caso de falla, por lo que se debe
   llamar a "PyErr_Occurred()" para verificar si hay errores.

   Ver también: The "PyUnicode_Equal()" function.

int PyUnicode_Equal(PyObject *a, PyObject *b)
    * Part of the Stable ABI since version 3.14.*

   Test if two strings are equal:

   * Return "1" if *a* is equal to *b*.

   * Return "0" if *a* is not equal to *b*.

   * Set a "TypeError" exception and return "-1" if *a* or *b* is not
     a "str" object.

   The function always succeeds if *a* and *b* are "str" objects.

   The function works for "str" subclasses, but does not honor custom
   "__eq__()" method.

   Ver también: The "PyUnicode_Compare()" function.

   Added in version 3.14.

int PyUnicode_EqualToUTF8AndSize(PyObject *unicode, const char *string, Py_ssize_t size)
    * Part of the Stable ABI since version 3.13.*

   Compare a Unicode object with a char buffer which is interpreted as
   being UTF-8 or ASCII encoded and return true ("1") if they are
   equal, or false ("0") otherwise. If the Unicode object contains
   surrogate code points ("U+D800" - "U+DFFF") or the C string is not
   valid UTF-8, false ("0") is returned.

   Esta función no lanza excepciones.

   Added in version 3.13.

int PyUnicode_EqualToUTF8(PyObject *unicode, const char *string)
    * Part of the Stable ABI since version 3.13.*

   Similar to "PyUnicode_EqualToUTF8AndSize()", but compute *string*
   length using "strlen()". If the Unicode object contains null
   characters, false ("0") is returned.

   Added in version 3.13.

int PyUnicode_CompareWithASCIIString(PyObject *unicode, const char *string)
    * Part of the Stable ABI.*

   Compare a Unicode object, *unicode*, with *string* and return "-1",
   "0", "1" for less than, equal, and greater than, respectively. It
   is best to pass only ASCII-encoded strings, but the function
   interprets the input string as ISO-8859-1 if it contains non-ASCII
   characters.

   Esta función no lanza excepciones.

PyObject *PyUnicode_RichCompare(PyObject *left, PyObject *right, int op)
    *Return value: New reference.** Part of the Stable ABI.*

   Comparación enriquecida de dos cadenas de caracteres Unicode y
   retorna uno de los siguientes:

   * "NULL" en caso de que se produzca una excepción

   * "Py_True" or "Py_False" for successful comparisons

   * "Py_NotImplemented" in case the type combination is unknown

   Possible values for *op* are "Py_GT", "Py_GE", "Py_EQ", "Py_NE",
   "Py_LT", and "Py_LE".

PyObject *PyUnicode_Format(PyObject *format, PyObject *args)
    *Return value: New reference.** Part of the Stable ABI.*

   Retorna un nuevo objeto de cadena de caracteres desde *format* y
   *args*; esto es análogo al "format % args".

int PyUnicode_Contains(PyObject *unicode, PyObject *substr)
    * Part of the Stable ABI.*

   Check whether *substr* is contained in *unicode* and return true or
   false accordingly.

   *substr* has to coerce to a one element Unicode string. "-1" is
   returned if there was an error.

void PyUnicode_InternInPlace(PyObject **p_unicode)
    * Part of the Stable ABI.*

   Intern the argument *p_unicode in place.  The argument must be the
   address of a pointer variable pointing to a Python Unicode string
   object.  If there is an existing interned string that is the same
   as *p_unicode, it sets *p_unicode to it (releasing the reference to
   the old string object and creating a new *strong reference* to the
   interned string object), otherwise it leaves *p_unicode alone and
   interns it.

   (Clarification: even though there is a lot of talk about
   references, think of this function as reference-neutral. You must
   own the object you pass in; after the call you no longer own the
   passed-in reference, but you newly own the result.)

   This function never raises an exception. On error, it leaves its
   argument unchanged without interning it.

   Instances of subclasses of "str" may not be interned, that is,
   PyUnicode_CheckExact(*p_unicode) must be true. If it is not, then
   -- as with any other error -- the argument is left unchanged.

   Note that interned strings are not “immortal”. You must keep a
   reference to the result to benefit from interning.

PyObject *PyUnicode_InternFromString(const char *str)
    *Return value: New reference.** Part of the Stable ABI.*

   A combination of "PyUnicode_FromString()" and
   "PyUnicode_InternInPlace()", meant for statically allocated
   strings.

   Return a new ("owned") reference to either a new Unicode string
   object that has been interned, or an earlier interned string object
   with the same value.

   Python may keep a reference to the result, or make it *immortal*,
   preventing it from being garbage-collected promptly. For interning
   an unbounded number of different strings, such as ones coming from
   user input, prefer calling "PyUnicode_FromString()" and
   "PyUnicode_InternInPlace()" directly.

unsigned int PyUnicode_CHECK_INTERNED(PyObject *str)

   Return a non-zero value if *str* is interned, zero if not. The
   *str* argument must be a string; this is not checked. This function
   always succeeds.

   **Detalles de implementación de CPython:** A non-zero return value
   may carry additional information about *how* the string is
   interned. The meaning of such non-zero values, as well as each
   specific string's intern-related details, may change between
   CPython versions.


PyUnicodeWriter
===============

The "PyUnicodeWriter" API can be used to create a Python "str" object.

Added in version 3.14.

type PyUnicodeWriter

   A Unicode writer instance.

   The instance must be destroyed by "PyUnicodeWriter_Finish()" on
   success, or "PyUnicodeWriter_Discard()" on error.

PyUnicodeWriter *PyUnicodeWriter_Create(Py_ssize_t length)

   Create a Unicode writer instance.

   *length* must be greater than or equal to "0".

   If *length* is greater than "0", preallocate an internal buffer of
   *length* characters.

   Set an exception and return "NULL" on error.

PyObject *PyUnicodeWriter_Finish(PyUnicodeWriter *writer)

   Return the final Python "str" object and destroy the writer
   instance.

   Set an exception and return "NULL" on error.

   The writer instance is invalid after this call.

void PyUnicodeWriter_Discard(PyUnicodeWriter *writer)

   Discard the internal Unicode buffer and destroy the writer
   instance.

   If *writer* is "NULL", no operation is performed.

   The writer instance is invalid after this call.

int PyUnicodeWriter_WriteChar(PyUnicodeWriter *writer, Py_UCS4 ch)

   Write the single Unicode character *ch* into *writer*.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_WriteUTF8(PyUnicodeWriter *writer, const char *str, Py_ssize_t size)

   Decode the string *str* from UTF-8 in strict mode and write the
   output into *writer*.

   *size* is the string length in bytes. If *size* is equal to "-1",
   call "strlen(str)" to get the string length.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

   See also "PyUnicodeWriter_DecodeUTF8Stateful()".

int PyUnicodeWriter_WriteASCII(PyUnicodeWriter *writer, const char *str, Py_ssize_t size)

   Write the ASCII string *str* into *writer*.

   *size* is the string length in bytes. If *size* is equal to "-1",
   call "strlen(str)" to get the string length.

   *str* must only contain ASCII characters. The behavior is undefined
   if *str* contains non-ASCII characters.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

   Added in version 3.14.

int PyUnicodeWriter_WriteWideChar(PyUnicodeWriter *writer, const wchar_t *str, Py_ssize_t size)

   Write the wide string *str* into *writer*.

   *size* is a number of wide characters. If *size* is equal to "-1",
   call "wcslen(str)" to get the string length.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_WriteUCS4(PyUnicodeWriter *writer, Py_UCS4 *str, Py_ssize_t size)

   Writer the UCS4 string *str* into *writer*.

   *size* is a number of UCS4 characters.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_WriteStr(PyUnicodeWriter *writer, PyObject *obj)

   Call "PyObject_Str()" on *obj* and write the output into *writer*.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_WriteRepr(PyUnicodeWriter *writer, PyObject *obj)

   Call "PyObject_Repr()" on *obj* and write the output into *writer*.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_WriteSubstring(PyUnicodeWriter *writer, PyObject *str, Py_ssize_t start, Py_ssize_t end)

   Write the substring "str[start:end]" into *writer*.

   *str* must be Python "str" object. *start* must be greater than or
   equal to 0, and less than or equal to *end*. *end* must be less
   than or equal to *str* length.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_Format(PyUnicodeWriter *writer, const char *format, ...)

   Similar to "PyUnicode_FromFormat()", but write the output directly
   into *writer*.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

int PyUnicodeWriter_DecodeUTF8Stateful(PyUnicodeWriter *writer, const char *string, Py_ssize_t length, const char *errors, Py_ssize_t *consumed)

   Decode the string *str* from UTF-8 with *errors* error handler and
   write the output into *writer*.

   *size* is the string length in bytes. If *size* is equal to "-1",
   call "strlen(str)" to get the string length.

   *errors* is an error handler name, such as ""replace"". If *errors*
   is "NULL", use the strict error handler.

   If *consumed* is not "NULL", set **consumed* to the number of
   decoded bytes on success. If *consumed* is "NULL", treat trailing
   incomplete UTF-8 byte sequences as an error.

   On success, return "0". On error, set an exception, leave the
   writer unchanged, and return "-1".

   See also "PyUnicodeWriter_WriteUTF8()".


Deprecated API
==============

The following API is deprecated.

type Py_UNICODE

   This is a typedef of "wchar_t", which is a 16-bit type or 32-bit
   type depending on the platform. Please use "wchar_t" directly
   instead.

   Distinto en la versión 3.3: En versiones anteriores, este era un
   tipo de 16 bits o de 32 bits, dependiendo de si seleccionó una
   versión Unicode "estrecha" o "amplia" de Python en el momento de la
   compilación.

   Deprecated since version 3.13, will be removed in version 3.15.

int PyUnicode_READY(PyObject *unicode)

   Do nothing and return "0". This API is kept only for backward
   compatibility, but there are no plans to remove it.

   Added in version 3.3.

   Obsoleto desde la versión 3.10: This API does nothing since Python
   3.12. Previously, this needed to be called for each string created
   using the old API ("PyUnicode_FromUnicode()" or similar).

unsigned int PyUnicode_IS_READY(PyObject *unicode)

   Do nothing and return "1". This API is kept only for backward
   compatibility, but there are no plans to remove it.

   Added in version 3.3.

   Obsoleto desde la versión 3.14: This API does nothing since Python
   3.12. Previously, this could be called to check if
   "PyUnicode_READY()" is necessary.
