I try to import Vpython and I get a "ZeroDivisionError"

[Jon2222]

I find out the source code of function register:

This is not the actual code of function register. For CPython, the actual code is written in C in file atexitmodule.c (see the C function atexit_register() in this file). So I actually replaced a function that does something by a function that does nothing.

We could replace by a function that targets more precisely the problem, for example

import atexit
import functools
import contextlib

def register():
    _atexit_register = atexit.register
    
    def register(func, *args, **kwargs):
        if func.__name__ == 'Exit':
            @functools.wraps(func)
            def wrapper(*args, **kwargs):
                with contextlib.suppress(ZeroDivisionError):
                    return func(*args, **kwargs)
            _atexit_register(wrapper, *args, **kwargs)
        else:
            _atexit_register(func, *args, **kwargs)
        return func
    register.old = _atexit_register
    return register
    
register = register()
atexit.register = register
try:
    from vpython import *
finally:
    atexit.register = register.old
    del register

I understand this, thank you.