Imagine there are two files horse.py and buffalo.py. horse.py is imported by another file rider.py. Is it possible to make it so that under certain circumstances possibly based on an environment variable or something similar that when rider.py imports horse.py, it actually imports buffalo.py sort of like a behind the scenes replacement so that rider.py needs little, preferably absolutely no modification? Right now, I am investigating the use of sys.modules and doing something using sys.modules['horse.py'] = 'buffalo.py'.
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