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isinstance+extend+append (solution that was found on the web) solution in Clear category for Flatten a List by naf-naf
def flat_list(array):
lst, res = [array], []
while lst:
elem = lst.pop(-1)
if isinstance(elem, list):
lst.extend(elem)
else:
res.append(elem)
return res[::-1]
if __name__ == '__main__':
assert flat_list([1, 2, 3]) == [1, 2, 3], "First"
assert flat_list([1, [2, 2, 2], 4]) == [1, 2, 2, 2, 4], "Second"
assert flat_list([[[2]], [4, [5, 6, [6], 6, 6, 6], 7]]) == [2, 4, 5, 6, 6, 6, 6, 6, 7], "Third"
assert flat_list([-1, [1, [-2], 1], -1]) == [-1, 1, -2, 1, -1], "Four"
print('Done! Check it')
March 23, 2020
