How to reload a module's function in Python?

Question

Following up on this question regarding reloading a module, how do I reload a specific function from a changed module?

pseudo-code:

from foo import b         


        

Answer 1

If you are the author of foo.py, you can write:

with open('bar.py') as f: bar_code=compile(f.read(),'bar.py','exec')

def bar(a,b):
    exec(bar_code)

def reload_bar():
    global bar_code
    with open('bar.py') as f: bar_code=compile(f.read(),'bar.py','exec') 

Then, in your pseudocode, reload if bar.py has changed. This approach is especially nice when bar lives in the same module as the code that wants to hot-reload it rather than the OP's case where it lives in a different module.