mutable default arguments don't have to be an issue
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Authored by vlorentz on Oct 7 2020, 12:28 PM.

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	import copy
	import functools
	from typing import Callable, TypeVar


	T = TypeVar("T", bound=Callable)

	def copydefaults(f: T) -> T:
	original_defaults = f.__defaults__

	@functools.wraps(f)
	def newf(args, *kwargs):
	f.__defaults__ = copy.deepcopy(original_defaults)
	return f(args, *kwargs)

	return newf


	@copydefaults
	def f(key, d={}):
	d[key] = 42
	return d

	print(f("foo")) # {'foo': 42}
	print(f("bar")) # {'bar': 42}

mutable default arguments don't have to be an issueActivePublicActions