Flattening list in Python by CoPilot

def flat_arr(li):

    result = []

    for item in li:

        if isinstance(item, list) or isistance(item, tuple):

            result.extend(flat_arr(item))

        else:

            result.append(item)

    return result

li = [[[0],1,["B","@"]], 6, 7, [1, 0.9]]

a = flat_arr(li)

print(a)