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In test_print() how about os.unlink(tfn)?  Why do you play
games with stdout, can't you do print >>f, ... ?  (If you
don't need stdout, it looks like you don't need sys.)

In defdict_on_missing() why do you check if the factory is
None?  It's the only place None is checked for, everywhere
else, it's just NULL.

defdict_repr should be static.

Type for this line in defdict_init() should be Py_ssize_t,
not int:
int n = PyTuple_GET_SIZE(args);