yeild高级用法

list1 = ['a', 'b', 'c']
list2 = ['1', '2']
list3 = ['sf', 'wh']


def TestYield():
    for element1 in list1:
        yield element1
    for element2 in list2:
        yield element2
    for element3 in list3:
        yield element3


if __name__ == '__main__':
    ele = TestYield()
    for e in ele:
        print(e)