recursively flatten nested iterables without fucking up stringlikes.

flattener.py

from collections.abc import Iterable

def should_flatten(x):
    return isinstance(x, Iterable) and not isinstance(x, (str, bytes))

def flatten(x, should_flatten=should_flatten):
    for y in x:
        if should_flatten(y):
            yield from flatten(y, should_flatten=should_flatten)
        else:
            yield y

h/t @altendky