Update the example in "Calling Python Functions from C" to use METH_VARARGS conventions and PyArg_ParseTuple(), and document the flag and where to look for PyArg_ParseTuple() info.
Update the example in "Calling Python Functions from C" to use
METH_VARARGS conventions and PyArg_ParseTuple(), and document the flag
and where to look for PyArg_ParseTuple() info.

Response to comment from Don Bashford <bashford@scripps.edu>.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator