Python生成器从另一个生成器调用产生所有内容

def gen(list):
    # ...
    if list:
        for x in gen(list[1:]):
            yield x

def gen(list):
    # ...
    if list:
        yield each in gen(list[1:])

yield from

yield_from_test.py

def gen_for(a_list):
    if a_list:
        yield a_list[0]
        for x in gen_for(a_list[1:]):
            yield x

def gen_yield(a_list):
    if a_list:
        yield a_list[0]
        yield from gen_yield(a_list[1:])

if __name__ == \'__main__\':
    assert list(gen_for([1,2,3])) == list(gen_yield([1,2,3]))
    print(list(gen_yield([1,2,3])))

» python3 yield_from_test.py 
[1, 2, 3]