Flattening List

[snippsat]

I want to break Python 2 support bye using yield from.

def flatten(seq):
    for item in seq:
        if isinstance(item, list):
            yield from flatten(item)
        else:
            yield item

lst = [[[2], [4, 1, 3]], [5, 7], 1, 10, [[[5, 5, 5], [4, 4, 4]]]]
print(list(flatten(lst)))

Output:
[2, 4, 1, 3, 5, 7, 1, 10, 5, 5, 5, 4, 4, 4]