Marmoset patching

gistfile1.py

import inspect

def marmoset_patch(func, s, r):
    source = inspect.getsource(func).replace(s, r)
    exec source in func.func_globals
    func.func_code = func.func_globals[func.__name__].func_code

def foo():
    print 1
    print 2
    print 3

foo()
# 1
# 2
# 3

marmoset_patch(foo, '3', "'ZOMG'")
foo()
# 1
# 2
# ZOMG

Please, don't actually do this.

Too late... you let the marmoset out of the bag!

This seems like a good idea. Thank you for helping a new programmer out with learning new techniques. :) More seriously, what is monkey patching?

@kellerkeller
a monkey patch is when you re-open an object for modification, some languages like ruby allow for this, and it's very common for large ruby apps to build classes out of several files. Python discourages monkey patching as looking through multiple files for where a method is defined gets tired fast, like the first time it happens, and as the Zen of Python tells us, explicit is better than implicit

O M G

Have the python people heard of this?

This technique intrigues me. I look forward to apply it in many real-life scenarios.

This is so wrong, the right solution is to use AST rewriting!