Brandon Rozek

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PhD Student @ RPI studying Automated Reasoning in AI and Linux Enthusiast.

Quick Python: Copy Decorator

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If you want to guarantee that your function doesn’t modify any of the references and don’t mind paying a price in memory consumption, here is a decorator you can easily add to your functions.

from copy import deepcopy
def copy_arguments(func):
    def wrapper(*args, **kwargs):
        new_args = deepcopy(args)
        new_kwargs = deepcopy(kwargs)
        return func(*new_args, **new_kwargs)
    return wrapper

Example usage:

def modify1(xs):
    for i, _ in enumerate(xs):
        xs[i] *= 2


def modify2(xs):
    for i, _ in enumerate(xs):
        xs[i] *= 2

a = [1, 2, 3, 4, 5]
b = [1, 2, 3, 4, 5]
[1, 2, 3, 4, 5]
[2, 4, 6, 8, 10]
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