##
7.2.1 String Objects

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

PyTypeObject `PyString_Type`
  This instance of `PyTypeObject` represents the Python string type.

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

PyObject* `PyString_FromStringAndSize` (const char *v, int len)
  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.

PyObject* `PyString_FromString` (const char *v)
  Returns a new string object with the value v on success, and `NULL` on failure.

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

char* `PyString_AsString` (PyObject *string)
  Resturns a `NULL` terminated representation of the contents of string.

void `PyString_Concat` (PyObject **string, PyObject *newpart)
  Creates a new string object in *string containing the contents of newpart appended to string. The old value of string have its reference count decremented. 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)
  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)
  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.

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

int `PyString_GET_SIZE` (PyObject *string)
  Macro form of `PyString_GetSize()` but without error checking.