斐波拉契数列（生成器）

def creat_fibonacci_series():
    a, b = 0, 1
    for i in range(5):
        yield b #如果生成器对象调用__next__()方法会将b作为返回值
        a, b = b, a+b

aa = creat_fibonacci_series()  #aa是一个生成器对象
for i in aa:
    print(i)

需要传递参数时

def test():
    i = 0
    while i < 5:
        temp = yield i
        print(temp)
        i += 1

t = test()
print(t.send(None))
print(t.send("hello"))
print(next(t))
print(t.__next__())
print(t.send("hi"))
#结果
"""
0
hello
1
None
2
None
3
hi
4
"""