7.3.2 Unicode Objects

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

Py_UNICODE: This type represents a 16-bit unsigned storage type which is used by Python internally as basis for holding Unicode ordinals. On platforms where wchar_t is available and also has 16-bits, Py_UNICODE is a typedef alias for wchar_t to enhance native platform compatibility. On all other platforms, Py_UNICODE is a typedef alias for unsigned short.

PyUnicodeObject: This subtype of PyObject represents a Python Unicode object.

PyTypeObject PyUnicode_Type: This instance of PyTypeObject represents the Python Unicode type.

The following APIs are really C macros and can be used to do fast checks and to access internal read-only data of Unicode objects:

int PyUnicode_Check(PyObject *o): Returns true if the object o is a Unicode object.

int PyUnicode_GET_SIZE(PyObject *o): Returns the size of the object. o has to be a PyUnicodeObject (not checked).

int PyUnicode_GET_DATA_SIZE(PyObject *o): Returns the size of the object's internal buffer in bytes. o has to be a PyUnicodeObject (not checked).

Py_UNICODE* PyUnicode_AS_UNICODE(PyObject *o): Returns a pointer to the internal Py_UNICODE buffer of the object. o has to be a PyUnicodeObject (not checked).

const char* PyUnicode_AS_DATA(PyObject *o): Returns a (const char *) pointer to the internal buffer of the object. o has to be a PyUnicodeObject (not checked).

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_UNICODE ch): Returns 1/0 depending on whether ch is a whitespace character.

int Py_UNICODE_ISLOWER(Py_UNICODE ch): Returns 1/0 depending on whether ch is a lowercase character.

int Py_UNICODE_ISUPPER(Py_UNICODE ch): Returns 1/0 depending on whether ch is an uppercase character.

int Py_UNICODE_ISTITLE(Py_UNICODE ch): Returns 1/0 depending on whether ch is a titlecase character.

int Py_UNICODE_ISLINEBREAK(Py_UNICODE ch): Returns 1/0 depending on whether ch is a linebreak character.

int Py_UNICODE_ISDECIMAL(Py_UNICODE ch): Returns 1/0 depending on whether ch is a decimal character.

int Py_UNICODE_ISDIGIT(Py_UNICODE ch): Returns 1/0 depending on whether ch is a digit character.

int Py_UNICODE_ISNUMERIC(Py_UNICODE ch): Returns 1/0 depending on whether ch is a numeric character.

int Py_UNICODE_ISALPHA(Py_UNICODE ch): Returns 1/0 depending on whether ch is an alphabetic character.

int Py_UNICODE_ISALNUM(Py_UNICODE ch): Returns 1/0 depending on whether ch is an alphanumeric character.

These APIs can be used for fast direct character conversions:

Py_UNICODE Py_UNICODE_TOLOWER(Py_UNICODE ch): Returns the character ch converted to lower case.

Py_UNICODE Py_UNICODE_TOUPPER(Py_UNICODE ch): Returns the character ch converted to upper case.

Py_UNICODE Py_UNICODE_TOTITLE(Py_UNICODE ch): Returns the character ch converted to title case.

int Py_UNICODE_TODECIMAL(Py_UNICODE ch): Returns the character ch converted to a decimal positive integer. Returns -1 in case this is not possible. Does not raise exceptions.

int Py_UNICODE_TODIGIT(Py_UNICODE ch): Returns the character ch converted to a single digit integer. Returns -1 in case this is not possible. Does not raise exceptions.

double Py_UNICODE_TONUMERIC(Py_UNICODE ch): Returns the character ch converted to a (positive) double. Returns -1.0 in case this is not possible. Does not raise exceptions.

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

PyObject* PyUnicode_FromUnicode(const Py_UNICODE *u, int size): Return value: 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.

Py_UNICODE* PyUnicode_AsUnicode(PyObject *unicode): Return a read-only pointer to the Unicode object's internal Py_UNICODE buffer.

int PyUnicode_GetSize(PyObject *unicode): Return the length of the Unicode object.

PyObject* PyUnicode_FromEncodedObject(PyObject *obj, const char *encoding, const char *errors)

Return value: New reference.

Coerce an encoded object obj to an Unicode object and return a reference with incremented refcount.

Coercion is done in the following way:

Unicode objects are passed back as-is with incremented refcount. Note: these cannot be decoded; passing a non-NULL value for encoding will result in a TypeError.
String and other char buffer compatible 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 the next section for details).
All other objects cause an exception.

The API returns NULL in case of an error. The caller is responsible for decref'ing the returned objects.

PyObject* PyUnicode_FromObject(PyObject *obj): Return value: New reference.

Shortcut for PyUnicode_FromEncodedObject(obj, NULL, ``strict'') which is used throughout the interpreter whenever coercion to Unicode is needed.

If the platform supports wchar_t and provides a header file wchar.h, Python can interface directly to this type using the following functions. Support is optimized if Python's own Py_UNICODE type is identical to the system's wchar_t.

PyObject* PyUnicode_FromWideChar(const wchar_t *w, int size): Return value: New reference.
Create a Unicode Object from the whcar_t buffer w of the given size. Returns NULL on failure.

int PyUnicode_AsWideChar(PyUnicodeObject *unicode, wchar_t *w, int size): Copies the Unicode Object contents into the whcar_t buffer w. At most size whcar_t characters are copied. Returns the number of whcar_t characters copied or -1 in case of an error.

Subsections

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