移动平均値

#移动平均值：类似打靶每打一枪看平均环数
def average():
    sum = 0
    count = 0
    avg = 0
    while 1:
        num = yield avg
        sum+=num
        count+=1
        avg=sum/count

g = average()
g.__next__()
q=g.send(20)
q=g.send(15)
print(q)