python生成器

def a():
    for i in range(10):
        yield i


# # print(a().__next__())
# for i in a():
#     print(i)


def b():
    for i in range(10):
        # print(i)
        c = yield i
        print(i)
        # print(c)

ff = b()


def c():
    a = yield
    print(a)
    yield

# for i in ff:
#     # print(i+2)
#     ff.send(i)
#     print(i)


cc = c()
for i in cc:
    recv = cc.send(5)
    # print(recv)

yield一次输入多次输出
yield+send可以做输入也可以做输出
当执行c = yield时 需要next()或者send(none),当第二次执行时才会进行c=yield的赋值操作,当执行完第二次yield后会继续寻找下一个yield  所以需要用yield结束  让他等待