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isinstance solution in Clear category for Flatten a List by joe_5588
from collections.abc import Iterable
def flat_list(array: list[int]) -> Iterable[int]:
output = []
for a in range(len(array)):
if isinstance(array[a], int):
output += [array[a]]
else:
output += flat_list(array[a])
return output
Sept. 11, 2023
