生成器send的用法案例

生成器函数send方法案例:
每输入一个值,求移动平均值,如下:
10 20 30 40 50...
10 15 20 25 30...
def avg_creater():
    num = 0
    count = 0
    avg = 0
    while True:
        num1 = yield avg
        num += num1
        count += 1
        avg = num/count

g = avg_creater()
g.__next__()
avg = g.send(10)
avg = g.send(20)
avg = g.send(30)
avg = g.send(40)
avg = g.send(50)
print(avg)


#打印:
30.0

 

但是每次使用时,第一次读取数据都必须用next接收,所以可以把这一步可以用装饰器函数替代,从而不用每次调用都要先使用next
预激生成器函数:
def avgcorator(f):
    def inner(*args,**kwargs):
        g = f(*args,**kwargs)
        g.__next__()
        return g
    return inner

@avgcorator
def func():
    num = 0
    count = 0
    avg = 0
    while True:
        num1 = yield avg
        num += num1
        count += 1
        avg = num / count
g = func()
avg = g.send(10)
avg = g.send(20)
avg = g.send(30)
avg = g.send(40)
avg = g.send(50)
print(avg)

#打印:
30.0

 

知识点:
生成器:send
装饰器




 

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