从键盘输入非0整数，以输入0为输入结束标志，求平均值，统计正数负数个数,python

num = int(input("请输入一个非0整数："))
pos_count = 0 # 正数个数
neg_count = 0 # 负数个数
sum = num
count = 1

while num != 0:
num = int(input("请输入一个非0整数："))
if num > 0:
pos_count += 1
elif num < 0:
neg_count += 1
sum += num
count += 1

if count == 1:
print("没有输入数字")
else:
avg = sum / (count - 1)
print("平均值为：", avg)
print("正数个数为：", pos_count)
print("负数个数为：", neg_count)