About Avoiding the Error of Changed Dictionary Size During Iteration
To avoid runtime errors of dictionary changing size during iteration when you need to add or remove values in a loop, make a copy at first:
from copy import deepcopy
d = {"a": "A", "b": "B", "c": "C"}
for key in deepcopy(d):
if not should_keep(key):
d.pop(key, None)
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