Monkey patching a class in another module in Python

Question

I\'m working with a module written by someone else. I\'d like to monkey patch the __init__ method of a class defined in the module. The examples I have found sh

Answer 1

The following should work:

import thirdpartymodule_a
import thirdpartymodule_b

def new_init(self):
    self.a = 43

thirdpartymodule_a.SomeClass.__init__ = new_init

thirdpartymodule_b.dosomething()

If you want the new init to call the old init replace the new_init() definition with the following:

old_init = thirdpartymodule_a.SomeClass.__init__
def new_init(self, *k, **kw):
    old_init(self, *k, **kw)
    self.a = 43