Offtopic again: PyArg_ParseTuple() is also nice for parsing a tuple in C code, which you for example receive as a result from calling a method. IIRC the only problem here is that it may throw weird error messages if the object is not a tuple. Instead of 'TypeError: unpack non-sequence' you get a 'SystemError: new style getargs format but argument is not a tuple'.
Should this be changed?
No, you should test for PyTuple_Check before calling PyArg_ParseTuple. Why do you think it's called that?
The other problem with this use, alas, is that when it catches a legitimate error, the error it reports is confusing if you don't change it. Example:
from socket import * s = socket(AF_INET, SOCK_STREAM) s.bind(())
Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: getsockaddrarg() takes exactly 2 arguments (0 given)
--Guido van Rossum (home page: http://www.python.org/%7Eguido/)