Cannot change behavior of imported function.

[zhengjxu]

Cannot change behavior of imported function.

[christophercrouzet]

Yes @zhengjxu, you're correct when saying that this doesn't wortk.

Unfortunately there is nothing that I can do to change this behaviour as this is simply how Python is designed.

When you first execute mod2.py, Python also executes all the modules to import, such as mod1.py, and compiles the result into a file containing all the byte code necessary to use mod2.py. Then, when you import mod1.py from another module to patch it, it will create yet another compiled file for that other module but won't change the modules already compiled, like the one for mod2.py.

In other words, you have to do all the monkey patching operations before you import any of these modules.

I hope this helps!