# yield 相当于return,控制的返回值
# res = yield 的另外一个特性,接收send传过来的值,赋值给res
def yieldTest():
    print("刘备")
    res = yield 1
    print("关羽", res)
    yield 2
    print("张飞")
    yield 3

g = yieldTest()
res = g.__next__()  # next(g)
print(res)
res = g.send("赵云") # send()也能出发生成器的执行
print(res)

通过yield实现单线程并发模式
def killMonster(name):
    while True:
        monNum = yield
        print("%s 正在杀[第%s个]怪物" % (name,monNum))

def playRole():
    g1 = killMonster("关公")
    g2 = killMonster("拿破仑")
    g1.__next__()
    g2.__next__()
    for i in range(10):
        g1.send(i+1)
        g2.send(i+1)

playRole()