函数进阶_生成器

# def generator():
#     print(123)
#     num = yield 1
#     print('$$$$$$',num)
#     print(456)
#     yield 2
#     print(789)
#
# g = generator()
# ret = g.__next__()
# print('***',ret)
# ret = g.send("hello")
# print("***", ret)

# send 获取下一个值的效果和next基本一致
# send 只是在上一个的值的位置发送一个值

#使用send的注意事项:
    #第一次使用生成器的时候,是用next获取下一个值
    #最后一个yield不能接收外部的值v看不见

#获取移动平均值
# avg = sum /count


# def average():
#     sum = 0
#     count = 0
#     avg = 0
#     while True:
#         # num = yield
#         num = yield avg
#         sum += num
#         count += 1
#         avg = sum / count
#
#
# avg_g = average()
# avg_g.__next__()
# avgl = avg_g.send(10)
# avgl = avg_g.send(20)
# avgl = avg_g.send(30)

# print(avgl)

def generator():
    a = "abcde"
    b = "12345"
    yield from a
    yield from b

g = generator()
for i in g :
    print(i)

#列表推导式
# egg_list = ["鸡蛋%s" % i for i in range(10)]
# print(egg_list)
#
# print([i*i for i in range(10)])
# 生成器表达式
# g = (i for i in range(10))
# # print(g)
# for i in g:
#     print(i)
#生成器表达式()