core.py 文件源码

def deep_iterate(li, pos=tuple(), yield_pos=False):
    """Iterate over all elements of Iterable li"""
    for j, elem in enumerate(li):
        if isinstance(elem, Iterable) and not isinstance(elem, str):
            yield from deep_iterate(
                elem, pos=(pos + (j, )), yield_pos=yield_pos
            )
        else:
            yield (elem, pos + (j, )) if yield_pos else elem