including :file:`Python.h`. If the macro is defined, length is a

:ctype:`Py_ssize_t` rather than an int.

This is similar to ``s``, but the code fills a :ctype:`Py_buffer` structure

provided by the caller. In this case the Python string may contain embedded

null bytes. Unicode objects pass back a pointer to the default encoded

Like ``s``, but the Python object may also be ``None``, in which case the C

pointer is set to *NULL*.

This is to ``s*`` as ``z`` is to ``s``.

``z#`` (string or ``None`` or any read buffer compatible object) [const char \*, int]

or use ``w#`` instead. Only single-segment buffer objects are accepted;

:exc:`TypeError` is raised for all others.

This is to ``w`` what ``s*`` is to ``s``.

``w#`` (read-write character buffer) [char \*, int]