iterfunction.py 文件源码

def flatten(iterable):
    """
    Return flattened iterable.

    >>> list(flatten([(1,2), (3,4,5)]))
    [1, 2, 3, 4, 5]

    :param iterable iterable:
    :return: Iterator over flattened elements of iterable
    :rtype: Iterator
    """
    return itt.chain(*iterable)