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Overriding warnings.showwarning() with a c/python module function (from a c/python module) doesn't work because warn_explicit() only allow PyFunction or PyMethod objects to be called (unfortunately c/python module functions are of type PyCFunction).
Suggested changes in _warnings.c (from py3k) - not tested at all:
from:
412 if (!PyMethod_Check(show_fxn) && !PyFunction_Check(show_fxn)) {
413 PyErr_SetString(PyExc_TypeError,
414 "warnings.showwarning() must be set to a "
415 "function or method");
to:
412 if (!PyCallable_Check(show_fxn)) {
413 PyErr_SetString(PyExc_TypeError,
414 "warnings.showwarning() must be set to a "
415 "callable");