evil1.py

class Magic:
    def __init__(self):
        pass


magic = Magic()

def setmagic(f):
    magic.__dict__[f.func_name] = f


def magic_deco(f):
    def wrapped(*args, **kwargs):
        magic.__dict__[f.__name__] = f
        return f(*args, **kwargs)
    return wrapped


def delimit_str(start, delim=" "):
    def out(*args):
        return reduce(lambda x, y: f"{x}{delim}{y}", args, start)
    out.func_name = start
    return out

setmagic(print)
setmagic(sum)

evil2.py

from evil import magic, setmagic, magic_deco

magic.sum([1,23])
magic.print("ok")
@magic_deco
def demo(a, b, c):
    return a + b + c

magic.demo # errors
demo(1, 2, 3)
magic.demo