Unicode Objects and Codecs
**************************


Unicode Objects
===============

Since the implementation of **PEP 393** in Python 3.3, Unicode objects
internally use a variety of representations, in order to allow
handling the complete range of Unicode characters while staying memory
efficient.  There are special cases for strings where all code points
are below 128, 256, or 65536; otherwise, code points must be below
1114112 (which is the full Unicode range).

Py_UNICODE* and UTF-8 representations are created on demand and cached
in the Unicode object.  The Py_UNICODE* representation is deprecated
and inefficient.

Due to the transition between the old APIs and the new APIs, Unicode
objects can internally be in two states depending on how they were
created:

* "canonical" Unicode objects are all objects created by a non-
  deprecated Unicode API.  They use the most efficient representation
  allowed by the implementation.

* "legacy" Unicode objects have been created through one of the
  deprecated APIs (typically "PyUnicode_FromUnicode()") and only bear
  the Py_UNICODE* representation; you will have to call
  "PyUnicode_READY()" on them before calling any other API.

Σημείωση:

  The "legacy" Unicode object will be removed in Python 3.12 with
  deprecated APIs. All Unicode objects will be "canonical" since then.
  See **PEP 623** for more information.


Unicode Type
------------

These are the basic Unicode object types used for the Unicode
implementation in Python:

type Py_UCS4
type Py_UCS2
type Py_UCS1
    * Μέρος του Σταθερό ABI.*

   These types are typedefs for unsigned integer types wide enough to
   contain characters of 32 bits, 16 bits and 8 bits, respectively.
   When dealing with single Unicode characters, use "Py_UCS4".

   Νέο στην έκδοση 3.3.

type Py_UNICODE

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

   Άλλαξε στην έκδοση 3.3: In previous versions, this was a 16-bit
   type or a 32-bit type depending on whether you selected a "narrow"
   or "wide" Unicode version of Python at build time.

type PyASCIIObject
type PyCompactUnicodeObject
type PyUnicodeObject

   These subtypes of "PyObject" represent a Python Unicode object.  In
   almost all cases, they shouldn't be used directly, since all API
   functions that deal with Unicode objects take and return "PyObject"
   pointers.

   Νέο στην έκδοση 3.3.

PyTypeObject PyUnicode_Type
    * Μέρος του Σταθερό ABI.*

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

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.

int PyUnicode_READY(PyObject *unicode)

   Ensure the string object *o* is in the "canonical" representation.
   This is required before using any of the access macros described
   below.

   Returns "0" on success and "-1" with an exception set on failure,
   which in particular happens if memory allocation fails.

   Νέο στην έκδοση 3.3.

   Καταργήθηκε στην έκδοση 3.10, θα αφαιρεθεί στην έκδοση 3.12: This
   API will be removed with "PyUnicode_FromUnicode()".

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).

   Νέο στην έκδοση 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 macro.  Make sure
   "PyUnicode_READY()" has been called before accessing this.

   Νέο στην έκδοση 3.3.

PyUnicode_WCHAR_KIND
PyUnicode_1BYTE_KIND
PyUnicode_2BYTE_KIND
PyUnicode_4BYTE_KIND

   Return values of the "PyUnicode_KIND()" macro.

   Νέο στην έκδοση 3.3.

   Καταργήθηκε στην έκδοση 3.10, θα αφαιρεθεί στην έκδοση 3.12:
   "PyUnicode_WCHAR_KIND" is deprecated.

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).

   Νέο στην έκδοση 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).

   Νέο στην έκδοση 3.3.

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

   Write into a canonical representation *data* (as obtained with
   "PyUnicode_DATA()").  This function performs no sanity checks, and
   is intended for usage in loops.  The caller should cache the *kind*
   value and *data* pointer as obtained from other calls.  *index* is
   the index in the string (starts at 0) and *value* is the new code
   point value which should be written to that location.

   Νέο στην έκδοση 3.3.

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

   Read a code point from a canonical representation *data* (as
   obtained with "PyUnicode_DATA()").  No checks or ready calls are
   performed.

   Νέο στην έκδοση 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.

   Νέο στην έκδοση 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.

   Νέο στην έκδοση 3.3.

Py_ssize_t PyUnicode_GET_SIZE(PyObject *unicode)

   Return the size of the deprecated "Py_UNICODE" representation, in
   code units (this includes surrogate pairs as 2 units).  *unicode*
   has to be a Unicode object (not checked).

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using
   "PyUnicode_GET_LENGTH()".

Py_ssize_t PyUnicode_GET_DATA_SIZE(PyObject *unicode)

   Return the size of the deprecated "Py_UNICODE" representation in
   bytes.  *unicode* has to be a Unicode object (not checked).

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using
   "PyUnicode_GET_LENGTH()".

Py_UNICODE *PyUnicode_AS_UNICODE(PyObject *unicode)
const char *PyUnicode_AS_DATA(PyObject *unicode)

   Return a pointer to a "Py_UNICODE" representation of the object.
   The returned buffer is always terminated with an extra null code
   point.  It may also contain embedded null code points, which would
   cause the string to be truncated when used in most C functions.
   The "AS_DATA" form casts the pointer to const char*.  The *unicode*
   argument has to be a Unicode object (not checked).

   Άλλαξε στην έκδοση 3.3: This function is now inefficient -- because
   in many cases the "Py_UNICODE" representation does not exist and
   needs to be created -- and can fail (return "NULL" with an
   exception set).  Try to port the code to use the new
   "PyUnicode_nBYTE_DATA()" macros or use "PyUnicode_WRITE()" or
   "PyUnicode_READ()".

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using the
   "PyUnicode_nBYTE_DATA()" family of macros.

int PyUnicode_IsIdentifier(PyObject *unicode)
    * Μέρος του Σταθερό ABI.*

   Return "1" if the string is a valid identifier according to the
   language definition, section Identifiers and keywords. Return "0"
   otherwise.

   Άλλαξε στην έκδοση 3.9: The function does not call
   "Py_FatalError()" anymore if the string is not ready.


Unicode Character Properties
----------------------------

Unicode provides many different character properties. The most often
needed ones are available through these macros which are mapped to C
functions depending on the Python configuration.

int Py_UNICODE_ISSPACE(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a whitespace
   character.

int Py_UNICODE_ISLOWER(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a lowercase
   character.

int Py_UNICODE_ISUPPER(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is an uppercase
   character.

int Py_UNICODE_ISTITLE(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a titlecase
   character.

int Py_UNICODE_ISLINEBREAK(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a linebreak
   character.

int Py_UNICODE_ISDECIMAL(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a decimal character.

int Py_UNICODE_ISDIGIT(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a digit character.

int Py_UNICODE_ISNUMERIC(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a numeric character.

int Py_UNICODE_ISALPHA(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is an alphabetic
   character.

int Py_UNICODE_ISALNUM(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is an alphanumeric
   character.

int Py_UNICODE_ISPRINTABLE(Py_UCS4 ch)

   Return "1" or "0" depending on whether *ch* is a printable
   character. Nonprintable characters are those characters defined in
   the Unicode character database as "Other" or "Separator", excepting
   the ASCII space (0x20) which is considered printable.  (Note that
   printable characters in this context are those which should not be
   escaped when "repr()" is invoked on a string. It has no bearing on
   the handling of strings written to "sys.stdout" or "sys.stderr".)

These APIs can be used for fast direct character conversions:

Py_UCS4 Py_UNICODE_TOLOWER(Py_UCS4 ch)

   Return the character *ch* converted to lower case.

   Αποσύρθηκε στην έκδοση 3.3: This function uses simple case
   mappings.

Py_UCS4 Py_UNICODE_TOUPPER(Py_UCS4 ch)

   Return the character *ch* converted to upper case.

   Αποσύρθηκε στην έκδοση 3.3: This function uses simple case
   mappings.

Py_UCS4 Py_UNICODE_TOTITLE(Py_UCS4 ch)

   Return the character *ch* converted to title case.

   Αποσύρθηκε στην έκδοση 3.3: This function uses simple case
   mappings.

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 macro 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 macro 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 macro does not raise exceptions.

These APIs can be used to work with surrogates:

Py_UNICODE_IS_SURROGATE(ch)

   Check if *ch* is a surrogate ("0xD800 <= ch <= 0xDFFF").

Py_UNICODE_IS_HIGH_SURROGATE(ch)

   Check if *ch* is a high surrogate ("0xD800 <= ch <= 0xDBFF").

Py_UNICODE_IS_LOW_SURROGATE(ch)

   Check if *ch* is a low surrogate ("0xDC00 <= ch <= 0xDFFF").

Py_UNICODE_JOIN_SURROGATES(high, low)

   Join two surrogate characters and return a single Py_UCS4 value.
   *high* and *low* are respectively the leading and trailing
   surrogates in a surrogate pair.


Creating and accessing Unicode strings
--------------------------------------

To create Unicode objects and access their basic sequence properties,
use these APIs:

PyObject *PyUnicode_New(Py_ssize_t size, Py_UCS4 maxchar)
    *Επιστρεφόμενη τιμή: New reference.*

   Create a new Unicode object.  *maxchar* should be the true maximum
   code point to be placed in the string.  As an approximation, it can
   be rounded up to the nearest value in the sequence 127, 255, 65535,
   1114111.

   This is the recommended way to allocate a new Unicode object.
   Objects created using this function are not resizable.

   Νέο στην έκδοση 3.3.

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

   Create a new Unicode object with the given *kind* (possible values
   are "PyUnicode_1BYTE_KIND" etc., as returned by
   "PyUnicode_KIND()").  The *buffer* must point to an array of *size*
   units of 1, 2 or 4 bytes per character, as given by the kind.

   If necessary, the input *buffer* is copied and transformed into the
   canonical representation.  For example, if the *buffer* is a UCS4
   string ("PyUnicode_4BYTE_KIND") and it consists only of codepoints
   in the UCS1 range, it will be transformed into UCS1
   ("PyUnicode_1BYTE_KIND").

   Νέο στην έκδοση 3.3.

PyObject *PyUnicode_FromStringAndSize(const char *str, Py_ssize_t size)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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. If the buffer is not "NULL", the return value might
   be a shared object, i.e. modification of the data is not allowed.

   If *str* is "NULL", this function behaves like
   "PyUnicode_FromUnicode()" with the buffer set to "NULL".  This
   usage is deprecated in favor of "PyUnicode_New()", and will be
   removed in Python 3.12.

PyObject *PyUnicode_FromString(const char *str)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

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

PyObject *PyUnicode_FromFormat(const char *format, ...)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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. The
   following format characters are allowed:

   +---------------------+-----------------------+------------------------------------+
   | Format Characters   | Type                  | Comment                            |
   |=====================|=======================|====================================|
   | "%%"                | *n/a*                 | The literal % character.           |
   +---------------------+-----------------------+------------------------------------+
   | "%c"                | int                   | A single character, represented as |
   |                     |                       | a C int.                           |
   +---------------------+-----------------------+------------------------------------+
   | "%d"                | int                   | Equivalent to "printf("%d")". [1]  |
   +---------------------+-----------------------+------------------------------------+
   | "%u"                | unsigned int          | Equivalent to "printf("%u")". [1]  |
   +---------------------+-----------------------+------------------------------------+
   | "%ld"               | long                  | Equivalent to "printf("%ld")". [1] |
   +---------------------+-----------------------+------------------------------------+
   | "%li"               | long                  | Equivalent to "printf("%li")". [1] |
   +---------------------+-----------------------+------------------------------------+
   | "%lu"               | unsigned long         | Equivalent to "printf("%lu")". [1] |
   +---------------------+-----------------------+------------------------------------+
   | "%lld"              | long long             | Equivalent to "printf("%lld")".    |
   |                     |                       | [1]                                |
   +---------------------+-----------------------+------------------------------------+
   | "%lli"              | long long             | Equivalent to "printf("%lli")".    |
   |                     |                       | [1]                                |
   +---------------------+-----------------------+------------------------------------+
   | "%llu"              | unsigned long long    | Equivalent to "printf("%llu")".    |
   |                     |                       | [1]                                |
   +---------------------+-----------------------+------------------------------------+
   | "%zd"               | "Py_ssize_t"          | Equivalent to "printf("%zd")". [1] |
   +---------------------+-----------------------+------------------------------------+
   | "%zi"               | "Py_ssize_t"          | Equivalent to "printf("%zi")". [1] |
   +---------------------+-----------------------+------------------------------------+
   | "%zu"               | size_t                | Equivalent to "printf("%zu")". [1] |
   +---------------------+-----------------------+------------------------------------+
   | "%i"                | int                   | Equivalent to "printf("%i")". [1]  |
   +---------------------+-----------------------+------------------------------------+
   | "%x"                | int                   | Equivalent to "printf("%x")". [1]  |
   +---------------------+-----------------------+------------------------------------+
   | "%s"                | const char*           | A null-terminated C character      |
   |                     |                       | array.                             |
   +---------------------+-----------------------+------------------------------------+
   | "%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*             | The result of calling "ascii()".   |
   +---------------------+-----------------------+------------------------------------+
   | "%U"                | PyObject*             | A Unicode object.                  |
   +---------------------+-----------------------+------------------------------------+
   | "%V"                | PyObject*, const      | A Unicode object (which may be     |
   |                     | char*                 | "NULL") and a null-terminated C    |
   |                     |                       | character array as a second        |
   |                     |                       | parameter (which will be used, if  |
   |                     |                       | the first parameter is "NULL").    |
   +---------------------+-----------------------+------------------------------------+
   | "%S"                | PyObject*             | The result of calling              |
   |                     |                       | "PyObject_Str()".                  |
   +---------------------+-----------------------+------------------------------------+
   | "%R"                | PyObject*             | The result of calling              |
   |                     |                       | "PyObject_Repr()".                 |
   +---------------------+-----------------------+------------------------------------+

   An unrecognized format character causes all the rest of the format
   string to be copied as-is to the result string, and any extra
   arguments discarded.

   Σημείωση:

     The width formatter unit is number of characters rather than
     bytes. The precision formatter unit is number of bytes 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").

   [1] For integer specifiers (d, u, ld, li, lu, lld, lli, llu, zd,
       zi, zu, i, x): the 0-conversion flag has effect even when a
       precision is given.

   Άλλαξε στην έκδοση 3.2: Support for ""%lld"" and ""%llu"" added.

   Άλλαξε στην έκδοση 3.3: Support for ""%li"", ""%lli"" and ""%zi""
   added.

   Άλλαξε στην έκδοση 3.4: Support width and precision formatter for
   ""%s"", ""%A"", ""%U"", ""%V"", ""%S"", ""%R"" added.

PyObject *PyUnicode_FromFormatV(const char *format, va_list vargs)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Identical to "PyUnicode_FromFormat()" except that it takes exactly
   two arguments.

PyObject *PyUnicode_FromObject(PyObject *obj)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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.

   Objects other than Unicode or its subtypes will cause a
   "TypeError".

PyObject *PyUnicode_FromEncodedObject(PyObject *obj, const char *encoding, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Decode an encoded object *obj* to a Unicode object.

   "bytes", "bytearray" and other *bytes-like objects* are decoded
   according to the given *encoding* and using the error handling
   defined by *errors*. Both can be "NULL" to have the interface use
   the default values (see Built-in Codecs for details).

   All other objects, including Unicode objects, cause a "TypeError"
   to be set.

   The API returns "NULL" if there was an error.  The caller is
   responsible for decref'ing the returned objects.

Py_ssize_t PyUnicode_GetLength(PyObject *unicode)
    * Μέρος του Σταθερό ABI από την έκδοση 3.7.*

   Return the length of the Unicode object, in code points.

   Νέο στην έκδοση 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.

   Νέο στην έκδοση 3.3.

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

   Fill a string with a character: write *fill_char* into
   "unicode[start:start+length]".

   Fail if *fill_char* is bigger than the string maximum character, or
   if the string has more than 1 reference.

   Return the number of written character, or return "-1" and raise an
   exception on error.

   Νέο στην έκδοση 3.3.

int PyUnicode_WriteChar(PyObject *unicode, Py_ssize_t index, Py_UCS4 character)
    * Μέρος του Σταθερό ABI από την έκδοση 3.7.*

   Write a character to a string.  The string must have been created
   through "PyUnicode_New()".  Since Unicode strings are supposed to
   be immutable, the string must not be shared, or have been hashed
   yet.

   This function checks that *unicode* is a Unicode object, that the
   index is not out of bounds, and that the object can be modified
   safely (i.e. that it its reference count is one).

   Νέο στην έκδοση 3.3.

Py_UCS4 PyUnicode_ReadChar(PyObject *unicode, Py_ssize_t index)
    * Μέρος του Σταθερό ABI από την έκδοση 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.

   Νέο στην έκδοση 3.3.

PyObject *PyUnicode_Substring(PyObject *unicode, Py_ssize_t start, Py_ssize_t end)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI από
   την έκδοση 3.7.*

   Return a substring of *unicode*, from character index *start*
   (included) to character index *end* (excluded).  Negative indices
   are not supported.

   Νέο στην έκδοση 3.3.

Py_UCS4 *PyUnicode_AsUCS4(PyObject *unicode, Py_UCS4 *buffer, Py_ssize_t buflen, int copy_null)
    * Μέρος του Σταθερό ABI από την έκδοση 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.

   Νέο στην έκδοση 3.3.

Py_UCS4 *PyUnicode_AsUCS4Copy(PyObject *unicode)
    * Μέρος του Σταθερό ABI από την έκδοση 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.

   Νέο στην έκδοση 3.3.


Deprecated Py_UNICODE APIs
--------------------------

Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12.

These API functions are deprecated with the implementation of **PEP
393**. Extension modules can continue using them, as they will not be
removed in Python 3.x, but need to be aware that their use can now
cause performance and memory hits.

PyObject *PyUnicode_FromUnicode(const Py_UNICODE *u, Py_ssize_t size)
    *Επιστρεφόμενη τιμή: New reference.*

   Create a Unicode object from the Py_UNICODE buffer *u* of the given
   size. *u* may be "NULL" which causes the contents to be undefined.
   It is the user's responsibility to fill in the needed data.  The
   buffer is copied into the new object.

   If the buffer is not "NULL", the return value might be a shared
   object. Therefore, modification of the resulting Unicode object is
   only allowed when *u* is "NULL".

   If the buffer is "NULL", "PyUnicode_READY()" must be called once
   the string content has been filled before using any of the access
   macros such as "PyUnicode_KIND()".

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using
   "PyUnicode_FromKindAndData()", "PyUnicode_FromWideChar()", or
   "PyUnicode_New()".

Py_UNICODE *PyUnicode_AsUnicode(PyObject *unicode)

   Return a read-only pointer to the Unicode object's internal
   "Py_UNICODE" buffer, or "NULL" on error. This will create the
   Py_UNICODE* representation of the object if it is not yet
   available. The buffer is always terminated with an extra null code
   point. Note that the resulting "Py_UNICODE" string may also contain
   embedded null code points, which would cause the string to be
   truncated when used in most C functions.

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using
   "PyUnicode_AsUCS4()", "PyUnicode_AsWideChar()",
   "PyUnicode_ReadChar()" or similar new APIs.

Py_UNICODE *PyUnicode_AsUnicodeAndSize(PyObject *unicode, Py_ssize_t *size)

   Like "PyUnicode_AsUnicode()", but also saves the "Py_UNICODE()"
   array length (excluding the extra null terminator) in *size*. Note
   that the resulting Py_UNICODE* string may contain embedded null
   code points, which would cause the string to be truncated when used
   in most C functions.

   Νέο στην έκδοση 3.3.

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using
   "PyUnicode_AsUCS4()", "PyUnicode_AsWideChar()",
   "PyUnicode_ReadChar()" or similar new APIs.

Py_ssize_t PyUnicode_GetSize(PyObject *unicode)
    * Μέρος του Σταθερό ABI.*

   Return the size of the deprecated "Py_UNICODE" representation, in
   code units (this includes surrogate pairs as 2 units).

   Καταργήθηκε στην έκδοση 3.3, θα αφαιρεθεί στην έκδοση 3.12: Part of
   the old-style Unicode API, please migrate to using
   "PyUnicode_GET_LENGTH()".


Locale Encoding
---------------

The current locale encoding can be used to decode text from the
operating system.

PyObject *PyUnicode_DecodeLocaleAndSize(const char *str, Py_ssize_t length, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI από
   την έκδοση 3.7.*

   Decode a string from UTF-8 on Android and VxWorks, or from the
   current locale encoding on other platforms. The supported error
   handlers are ""strict"" and ""surrogateescape"" (**PEP 383**). The
   decoder uses ""strict"" error handler if *errors* is "NULL".  *str*
   must end with a null character but cannot contain embedded null
   characters.

   Use "PyUnicode_DecodeFSDefaultAndSize()" to decode a string from
   "Py_FileSystemDefaultEncoding" (the locale encoding read at Python
   startup).

   This function ignores the Python UTF-8 Mode.

   Δείτε επίσης: The "Py_DecodeLocale()" function.

   Νέο στην έκδοση 3.3.

   Άλλαξε στην έκδοση 3.7: The function now also uses the current
   locale encoding for the "surrogateescape" error handler, except on
   Android. Previously, "Py_DecodeLocale()" was used for the
   "surrogateescape", and the current locale encoding was used for
   "strict".

PyObject *PyUnicode_DecodeLocale(const char *str, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI από
   την έκδοση 3.7.*

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

   Νέο στην έκδοση 3.3.

PyObject *PyUnicode_EncodeLocale(PyObject *unicode, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI από
   την έκδοση 3.7.*

   Encode a Unicode object to UTF-8 on Android and VxWorks, or to the
   current locale encoding on other platforms. The supported error
   handlers are ""strict"" and ""surrogateescape"" (**PEP 383**). The
   encoder uses ""strict"" error handler if *errors* is "NULL". Return
   a "bytes" object. *unicode* cannot contain embedded null
   characters.

   Use "PyUnicode_EncodeFSDefault()" to encode a string to
   "Py_FileSystemDefaultEncoding" (the locale encoding read at Python
   startup).

   This function ignores the Python UTF-8 Mode.

   Δείτε επίσης: The "Py_EncodeLocale()" function.

   Νέο στην έκδοση 3.3.

   Άλλαξε στην έκδοση 3.7: The function now also uses the current
   locale encoding for the "surrogateescape" error handler, except on
   Android. Previously, "Py_EncodeLocale()" was used for the
   "surrogateescape", and the current locale encoding was used for
   "strict".


File System Encoding
--------------------

To encode and decode file names and other environment strings,
"Py_FileSystemDefaultEncoding" should be used as the encoding, and
"Py_FileSystemDefaultEncodeErrors" should be used as the 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)
    * Μέρος του Σταθερό ABI.*

   ParseTuple 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 a PyBytesObject* which must be released when it is
   no longer used.

   Νέο στην έκδοση 3.1.

   Άλλαξε στην έκδοση 3.6: Accepts a *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)
    * Μέρος του Σταθερό ABI.*

   ParseTuple 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 a PyUnicodeObject* which must be
   released when it is no longer used.

   Νέο στην έκδοση 3.2.

   Άλλαξε στην έκδοση 3.6: Accepts a *path-like object*.

PyObject *PyUnicode_DecodeFSDefaultAndSize(const char *str, Py_ssize_t size)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Decode a string from the *filesystem encoding and error handler*.

   If "Py_FileSystemDefaultEncoding" is not set, fall back to the
   locale encoding.

   "Py_FileSystemDefaultEncoding" is initialized at startup from the
   locale encoding and cannot be modified later. If you need to decode
   a string from the current locale encoding, use
   "PyUnicode_DecodeLocaleAndSize()".

   Δείτε επίσης: The "Py_DecodeLocale()" function.

   Άλλαξε στην έκδοση 3.6: Use "Py_FileSystemDefaultEncodeErrors"
   error handler.

PyObject *PyUnicode_DecodeFSDefault(const char *str)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Decode a null-terminated string from the *filesystem encoding and
   error handler*.

   If "Py_FileSystemDefaultEncoding" is not set, fall back to the
   locale encoding.

   Use "PyUnicode_DecodeFSDefaultAndSize()" if you know the string
   length.

   Άλλαξε στην έκδοση 3.6: Use "Py_FileSystemDefaultEncodeErrors"
   error handler.

PyObject *PyUnicode_EncodeFSDefault(PyObject *unicode)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object to "Py_FileSystemDefaultEncoding" with the
   "Py_FileSystemDefaultEncodeErrors" error handler, and return
   "bytes". Note that the resulting "bytes" object may contain null
   bytes.

   If "Py_FileSystemDefaultEncoding" is not set, fall back to the
   locale encoding.

   "Py_FileSystemDefaultEncoding" is initialized at startup from the
   locale encoding and cannot be modified later. If you need to encode
   a string to the current locale encoding, use
   "PyUnicode_EncodeLocale()".

   Δείτε επίσης: The "Py_EncodeLocale()" function.

   Νέο στην έκδοση 3.2.

   Άλλαξε στην έκδοση 3.6: Use "Py_FileSystemDefaultEncodeErrors"
   error handler.


wchar_t Support
---------------

"wchar_t" support for platforms which support it:

PyObject *PyUnicode_FromWideChar(const wchar_t *wstr, Py_ssize_t size)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    * Μέρος του Σταθερό 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)
    * Μέρος του Σταθερό ABI από την έκδοση 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.

   Νέο στην έκδοση 3.2.

   Άλλαξε στην έκδοση 3.7: Raises a "ValueError" if *size* is "NULL"
   and the wchar_t* string contains null characters.


Built-in Codecs
===============

Python provides a set of built-in codecs which are written in C for
speed. All of these codecs are directly usable via the following
functions.

Many of the following APIs take two arguments encoding and errors, and
they have the same semantics as the ones of the built-in "str()"
string object constructor.

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
variable "Py_FileSystemDefaultEncoding" internally. This variable
should be treated as read-only: on some systems, it will be a pointer
to a static string, on others, it will change at run-time (such as
when the application invokes setlocale).

Error handling is set by errors which may also be set to "NULL"
meaning to use the default handling defined for the codec.  Default
error handling for all built-in codecs is "strict" ("ValueError" is
raised).

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


Generic Codecs
--------------

These are the generic codec APIs:

PyObject *PyUnicode_Decode(const char *str, Py_ssize_t size, const char *encoding, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object and return the result as Python bytes
   object. *encoding* and *errors* have the same meaning as the
   parameters of the same name in the Unicode "encode()" method. The
   codec to be used is looked up using the Python codec registry.
   Return "NULL" if an exception was raised by the codec.


UTF-8 Codecs
------------

These are the UTF-8 codec APIs:

PyObject *PyUnicode_DecodeUTF8(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   If *consumed* is "NULL", behave like "PyUnicode_DecodeUTF8()". If
   *consumed* is not "NULL", trailing incomplete UTF-8 byte sequences
   will not be treated as an error. Those bytes will not be decoded
   and the number of bytes that have been decoded will be stored in
   *consumed*.

PyObject *PyUnicode_AsUTF8String(PyObject *unicode)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object using UTF-8 and return the result as Python
   bytes object.  Error handling is "strict".  Return "NULL" if an
   exception was raised by the codec.

const char *PyUnicode_AsUTF8AndSize(PyObject *unicode, Py_ssize_t *size)
    * Μέρος του Σταθερό ABI από την έκδοση 3.10.*

   Return a pointer to the UTF-8 encoding of the Unicode object, and
   store the size of the encoded representation (in bytes) in *size*.
   The *size* argument can be "NULL"; in this case no size will be
   stored.  The returned buffer always has an extra null byte appended
   (not included in *size*), regardless of whether there are any other
   null code points.

   In the case of an error, "NULL" is returned with an exception set
   and no *size* is stored.

   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.

   Νέο στην έκδοση 3.3.

   Άλλαξε στην έκδοση 3.7: The return type is now "const char *"
   rather of "char *".

   Άλλαξε στην έκδοση 3.10: This function is a part of the limited
   API.

const char *PyUnicode_AsUTF8(PyObject *unicode)

   As "PyUnicode_AsUTF8AndSize()", but does not store the size.

   Νέο στην έκδοση 3.3.

   Άλλαξε στην έκδοση 3.7: The return type is now "const char *"
   rather of "char *".


UTF-32 Codecs
-------------

These are the UTF-32 codec APIs:

PyObject *PyUnicode_DecodeUTF32(const char *str, Py_ssize_t size, const char *errors, int *byteorder)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Decode *size* bytes from a UTF-32 encoded buffer string and return
   the corresponding Unicode object.  *errors* (if non-"NULL") defines
   the error handling. It defaults to "strict".

   If *byteorder* is non-"NULL", the decoder starts decoding using the
   given byte order:

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

   If "*byteorder" is zero, and the first four bytes of the input data
   are a byte order mark (BOM), the decoder switches to this byte
   order and the BOM is not copied into the resulting Unicode string.
   If "*byteorder" is "-1" or "1", any byte order mark is copied to
   the output.

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

   If *byteorder* is "NULL", the codec starts in native order mode.

   Return "NULL" if an exception was raised by the codec.

PyObject *PyUnicode_DecodeUTF32Stateful(const char *str, Py_ssize_t size, const char *errors, int *byteorder, Py_ssize_t *consumed)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   If *consumed* is "NULL", behave like "PyUnicode_DecodeUTF32()". If
   *consumed* is not "NULL", "PyUnicode_DecodeUTF32Stateful()" will
   not treat trailing incomplete UTF-32 byte sequences (such as a
   number of bytes not divisible by four) as an error. Those bytes
   will not be decoded and the number of bytes that have been decoded
   will be stored in *consumed*.

PyObject *PyUnicode_AsUTF32String(PyObject *unicode)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Return a Python byte string using the UTF-32 encoding in native
   byte order. The string always starts with a BOM mark.  Error
   handling is "strict". Return "NULL" if an exception was raised by
   the codec.


UTF-16 Codecs
-------------

These are the UTF-16 codec APIs:

PyObject *PyUnicode_DecodeUTF16(const char *str, Py_ssize_t size, const char *errors, int *byteorder)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Decode *size* bytes from a UTF-16 encoded buffer string and return
   the corresponding Unicode object.  *errors* (if non-"NULL") defines
   the error handling. It defaults to "strict".

   If *byteorder* is non-"NULL", the decoder starts decoding using the
   given byte order:

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

   If "*byteorder" is zero, and the first two bytes of the input data
   are a byte order mark (BOM), the decoder switches to this byte
   order and the BOM is not copied into the resulting Unicode string.
   If "*byteorder" is "-1" or "1", any byte order mark is copied to
   the output (where it will result in either a "\ufeff" or a "\ufffe"
   character).

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

   If *byteorder* is "NULL", the codec starts in native order mode.

   Return "NULL" if an exception was raised by the codec.

PyObject *PyUnicode_DecodeUTF16Stateful(const char *str, Py_ssize_t size, const char *errors, int *byteorder, Py_ssize_t *consumed)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   If *consumed* is "NULL", behave like "PyUnicode_DecodeUTF16()". If
   *consumed* is not "NULL", "PyUnicode_DecodeUTF16Stateful()" will
   not treat trailing incomplete UTF-16 byte sequences (such as an odd
   number of bytes or a split surrogate pair) as an error. Those bytes
   will not be decoded and the number of bytes that have been decoded
   will be stored in *consumed*.

PyObject *PyUnicode_AsUTF16String(PyObject *unicode)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Return a Python byte string using the UTF-16 encoding in native
   byte order. The string always starts with a BOM mark.  Error
   handling is "strict". Return "NULL" if an exception was raised by
   the codec.


UTF-7 Codecs
------------

These are the UTF-7 codec APIs:

PyObject *PyUnicode_DecodeUTF7(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   If *consumed* is "NULL", behave like "PyUnicode_DecodeUTF7()".  If
   *consumed* is not "NULL", trailing incomplete UTF-7 base-64
   sections will not be treated as an error.  Those bytes will not be
   decoded and the number of bytes that have been decoded will be
   stored in *consumed*.


Unicode-Escape Codecs
---------------------

These are the "Unicode Escape" codec APIs:

PyObject *PyUnicode_DecodeUnicodeEscape(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object using Unicode-Escape and return the result
   as a bytes object.  Error handling is "strict".  Return "NULL" if
   an exception was raised by the codec.


Raw-Unicode-Escape Codecs
-------------------------

These are the "Raw Unicode Escape" codec APIs:

PyObject *PyUnicode_DecodeRawUnicodeEscape(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object using Raw-Unicode-Escape and return the
   result as a bytes object.  Error handling is "strict".  Return
   "NULL" if an exception was raised by the codec.


Latin-1 Codecs
--------------

These are the Latin-1 codec APIs: Latin-1 corresponds to the first 256
Unicode ordinals and only these are accepted by the codecs during
encoding.

PyObject *PyUnicode_DecodeLatin1(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object using Latin-1 and return the result as
   Python bytes object.  Error handling is "strict".  Return "NULL" if
   an exception was raised by the codec.


ASCII Codecs
------------

These are the ASCII codec APIs.  Only 7-bit ASCII data is accepted.
All other codes generate errors.

PyObject *PyUnicode_DecodeASCII(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object using ASCII and return the result as Python
   bytes object.  Error handling is "strict".  Return "NULL" if an
   exception was raised by the codec.


Character Map Codecs
--------------------

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.

These are the mapping codec APIs:

PyObject *PyUnicode_DecodeCharmap(const char *str, Py_ssize_t length, PyObject *mapping, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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.

   If *mapping* is "NULL", Latin-1 decoding will be applied.  Else
   *mapping* must map bytes ordinals (integers in the range from 0 to
   255) to Unicode strings, integers (which are then interpreted as
   Unicode ordinals) or "None".  Unmapped data bytes -- ones which
   cause a "LookupError", as well as ones which get mapped to "None",
   "0xFFFE" or "'\ufffe'", are treated as undefined mappings and cause
   an error.

PyObject *PyUnicode_AsCharmapString(PyObject *unicode, PyObject *mapping)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Encode a Unicode object using the given *mapping* object and return
   the result as a bytes object.  Error handling is "strict".  Return
   "NULL" if an exception was raised by the codec.

   The *mapping* object must map Unicode ordinal integers to bytes
   objects, integers in the range from 0 to 255 or "None".  Unmapped
   character ordinals (ones which cause a "LookupError") as well as
   mapped to "None" are treated as "undefined mapping" and cause an
   error.

The following codec API is special in that maps Unicode to Unicode.

PyObject *PyUnicode_Translate(PyObject *unicode, PyObject *table, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Translate a string by applying a character mapping table to it and
   return the resulting Unicode object. Return "NULL" if an exception
   was raised by the codec.

   The mapping table must map Unicode ordinal integers to Unicode
   ordinal integers or "None" (causing deletion of the character).

   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* has the usual meaning for codecs. It may be "NULL" which
   indicates to use the default error handling.


MBCS codecs for Windows
-----------------------

These are the MBCS codec APIs. They are currently only available on
Windows and use the Win32 MBCS converters to implement the
conversions.  Note that MBCS (or DBCS) is a class of encodings, not
just one.  The target encoding is defined by the user settings on the
machine running the codec.

PyObject *PyUnicode_DecodeMBCS(const char *str, Py_ssize_t size, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI on
   Windows από την έκδοση 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI on
   Windows από την έκδοση 3.7.*

   If *consumed* is "NULL", behave like "PyUnicode_DecodeMBCS()". If
   *consumed* is not "NULL", "PyUnicode_DecodeMBCSStateful()" will not
   decode trailing lead byte and the number of bytes that have been
   decoded will be stored in *consumed*.

PyObject *PyUnicode_AsMBCSString(PyObject *unicode)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI on
   Windows από την έκδοση 3.7.*

   Encode a Unicode object using MBCS and return the result as Python
   bytes object.  Error handling is "strict".  Return "NULL" if an
   exception was raised by the codec.

PyObject *PyUnicode_EncodeCodePage(int code_page, PyObject *unicode, const char *errors)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI on
   Windows από την έκδοση 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.

   Νέο στην έκδοση 3.3.


Methods & Slots
---------------


Methods and Slot Functions
==========================

The following APIs are capable of handling Unicode objects and strings
on input (we refer to them as strings in the descriptions) and return
Unicode objects or integers as appropriate.

They all return "NULL" or "-1" if an exception occurs.

PyObject *PyUnicode_Concat(PyObject *left, PyObject *right)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Concat two strings giving a new Unicode string.

PyObject *PyUnicode_Split(PyObject *unicode, PyObject *sep, Py_ssize_t maxsplit)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Split a string giving a list of Unicode strings.  If *sep* is
   "NULL", splitting will be done at all whitespace substrings.
   Otherwise, splits occur at the given separator.  At most *maxsplit*
   splits will be done.  If negative, no limit is set.  Separators are
   not included in the resulting list.

PyObject *PyUnicode_Splitlines(PyObject *unicode, int keepends)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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_Join(PyObject *separator, PyObject *seq)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Join a sequence of strings using the given *separator* and return
   the resulting Unicode string.

Py_ssize_t PyUnicode_Tailmatch(PyObject *unicode, PyObject *substr, Py_ssize_t start, Py_ssize_t end, int direction)
    * Μέρος του Σταθερό 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)
    * Μέρος του Σταθερό 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)
    * Μέρος του Σταθερό ABI από την έκδοση 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.

   Νέο στην έκδοση 3.3.

   Άλλαξε στην έκδοση 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)
    * Μέρος του Σταθερό 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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό 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)
    * Μέρος του Σταθερό ABI.*

   Compare two strings and return "-1", "0", "1" for less than, equal,
   and greater than, respectively.

   This function returns "-1" upon failure, so one should call
   "PyErr_Occurred()" to check for errors.

int PyUnicode_CompareWithASCIIString(PyObject *unicode, const char *string)
    * Μέρος του Σταθερό 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.

   This function does not raise exceptions.

PyObject *PyUnicode_RichCompare(PyObject *left, PyObject *right, int op)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Rich compare two Unicode strings and return one of the following:

   * "NULL" in case an exception was raised

   * "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)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   Return a new string object from *format* and *args*; this is
   analogous to "format % args".

int PyUnicode_Contains(PyObject *unicode, PyObject *substr)
    * Μέρος του Σταθερό 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)
    * Μέρος του Σταθερό 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 (creating a new *strong reference*). (Clarification:
   even though there is a lot of talk about references, think of this
   function as reference-neutral; you own the object after the call if
   and only if you owned it before the call.)

PyObject *PyUnicode_InternFromString(const char *str)
    *Επιστρεφόμενη τιμή: New reference.** Μέρος του Σταθερό ABI.*

   A combination of "PyUnicode_FromString()" and
   "PyUnicode_InternInPlace()", returning either a new Unicode string
   object that has been interned, or a new ("owned") reference to an
   earlier interned string object with the same value.
