7.3.1 String Objects

These functions raise TypeError when expecting a string parameter and are called with a non-string parameter.

PyStringObject: This subtype of PyObject represents a Python string object.

PyTypeObject PyString_Type: This instance of PyTypeObject represents the Python string type; it is the same object as types.TypeType in the Python layer. .

int PyString_Check(PyObject *o): Returns true if the object o is a string object.

PyObject* PyString_FromString(const char *v): Return value: New reference.
Returns a new string object with the value v on success, and NULL on failure. The parameter v must not be NULL; it will not be checked.

PyObject* PyString_FromStringAndSize(const char *v, int len): Return value: New reference.
Returns a new string object with the value v and length len on success, and NULL on failure. If v is NULL, the contents of the string are uninitialized.

int PyString_Size(PyObject *string): Returns the length of the string in string object string.

int PyString_GET_SIZE(PyObject *string): Macro form of PyString_Size() but without error checking.

char* PyString_AsString(PyObject *string): Returns a null-terminated representation of the contents of string. The pointer refers to the internal buffer of string, not a copy. The data must not be modified in any way, unless the string was just created using PyString_FromStringAndSize(NULL, size). It must not be deallocated.

char* PyString_AS_STRING(PyObject *string): Macro form of PyString_AsString() but without error checking.

int PyString_AsStringAndSize(PyObject *obj, char **buffer, int *length)

Returns a null-terminated representation of the contents of the object obj through the output variables buffer and length.

The function accepts both string and Unicode objects as input. For Unicode objects it returns the default encoded version of the object. If length is set to NULL, the resulting buffer may not contain null characters; if it does, the function returns -1 and a TypeError is raised.

The buffer refers to an internal string buffer of obj, not a copy. The data must not be modified in any way, unless the string was just created using PyString_FromStringAndSize(NULL, size). It must not be deallocated.

void PyString_Concat(PyObject **string, PyObject *newpart): Creates a new string object in *string containing the contents of newpart appended to string; the caller will own the new reference. The reference to the old value of string will be stolen. If the new string cannot be created, the old reference to string will still be discarded and the value of *string will be set to NULL; the appropriate exception will be set.

void PyString_ConcatAndDel(PyObject **string, PyObject *newpart): Creates a new string object in *string containing the contents of newpart appended to string. This version decrements the reference count of newpart.

int _PyString_Resize(PyObject **string, int newsize): A way to resize a string object even though it is ``immutable''. Only use this to build up a brand new string object; don't use this if the string may already be known in other parts of the code.

PyObject* PyString_Format(PyObject *format, PyObject *args): Return value: New reference.
Returns a new string object from format and args. Analogous to format % args. The args argument must be a tuple.

void PyString_InternInPlace(PyObject **string): Intern the argument *string in place. The argument must be the address of a pointer variable pointing to a Python string object. If there is an existing interned string that is the same as *string, it sets *string to it (decrementing the reference count of the old string object and incrementing the reference count of the interned string object), otherwise it leaves *string alone and interns it (incrementing its reference count). (Clarification: even though there is a lot of talk about reference counts, think of this function as reference-count-neutral; you own the object after the call if and only if you owned it before the call.)

PyObject* PyString_InternFromString(const char *v): Return value: New reference.
A combination of PyString_FromString() and PyString_InternInPlace(), returning either a new string object that has been interned, or a new (``owned'') reference to an earlier interned string object with the same value.

PyObject* PyString_Decode(const char *s, int size, const char *encoding, const char *errors): Return value: New reference.
Create a string object by decoding size bytes of the encoded buffer s. encoding and errors have the same meaning as the parameters of the same name in the unicode() builtin function. The codec to be used is looked up using the Python codec registry. Returns NULL in case an exception was raised by the codec.

PyObject* PyString_Encode(const Py_UNICODE *s, int size, const char *encoding, const char *errors): Return value: New reference.
Encodes the Py_UNICODE buffer of the given size and returns a Python string object. encoding and errors have the same meaning as the parameters of the same name in the string .encode() method. The codec to be used is looked up using the Python codec registry. Returns NULL in case an exception was raised by the codec.

PyObject* PyString_AsEncodedString(PyObject *unicode, const char *encoding, const char *errors): Return value: New reference.
Encodes a string object and returns the result as Python string object. encoding and errors have the same meaning as the parameters of the same name in the string .encode() method. The codec to be used is looked up using the Python codec registry. Returns NULL in case an exception was raised by the codec.

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