flatten arbitrarily nested iterables

flatten.py

from collections.abc import Iterable


def flatten(seq, maxdepth=10):
    if maxdepth <= 0:
        raise ValueError
    if isinstance(seq, Iterable) and not isinstance(seq, str):
        for item in seq:
            yield from flatten(item, maxdepth - 1)
    else:
        yield seq


if __name__ == '__main__':
    print(list(flatten([5, [1], [2], [[3], [4, 7, 'bar'], 6, 'foo']])))