How to modify imported source code on-the-fly?

Question

Suppose I have a module file like this:

# my_module.py
print(\"hello\")

Then I have a simple script:

# my_script.py
import          


        

Answer 1

This doesn't answer the general question of dynamically modifying the source code of an imported module, but to "Override" or "monkey-patch" its use of the print() function can be done (since it's a built-in function in Python 3.x). Here's how:

#!/usr/bin/env python3
# my_script.py

import builtins

_print = builtins.print

def my_print(*args, **kwargs):
    _print('In my_print: ', end='')
    return _print(*args, **kwargs)

builtins.print = my_print

import my_module  # -> In my_print: hello