题解 | #记负均正II#

主要是python如何输入：每行一组数据，eof结尾

while True:
    try:
        num = int(input())
        if num < 0 :
            nz+=1
        else:
            ss = ss+num
            ns+=1
    except EOFError:
        break

代码

nz = 0
ss = .0
ns = 0
while True:
    try:
        num = int(input())
        if num < 0 :
            nz+=1
        else:
            ss = ss+num
            ns+=1
    except EOFError:
        break
print(nz)
if ns>0:
    ss = ss/ns
ss =('%.1f' % ss)
print(ss)