对yield的初步理解介绍

def go():

  while True:

    data = 1

    r = yield data # data是返回值，r是接收值

    print("data", data)

    print("A1", r)

    data += 1

    r = yield data

    print("data",data)

    r += r

    print("A2", r)

    data += 1

    r = yield data

    print("data",data)

    print("A3", r)

    # 运行时此后若找不到下一个yield，则会报错StopIteration

my = go()

print("my", my)

print("None", my.send(None))

print(my.send("1"))

print(my.send("2"))

print(my.send("3"))