SystemError: new style getargs format but argument is not a tuple

[zefciu]

Thinker wrote:

> You can add some printf() to throw out messages to make sure where the
> program stop at.
> If you can compile the module with debug information and use gdb to
> backtrace dump file,
> it would be useful.

Did it.  The arguments are parsed, but the coord tuple isn't.  But can
PyArg_ParseTuple be used to tuples other than function arguments?  If
not, what should I use?

zefciu