我正在用 Python 写一个作业，我只能使用:slice 方法（例如group= strg [:index]）进行切片。不知何故，当切片操作处理数字时，它无法处理超过两位数的数据。文字可以处理，但数字会被截断。
这是我的代码：
import sys
# set up for for loop
length = len(sys.argv)
for i in range(1, length):
strg = sys.argv[i]
#finds name
index = strg.find(':')
name = strg[:index]
strg = strg[index+1:]
index = strg.find(',')
total = 0
count = 0
while (index != -1):
group = strg[:index]
try:
num = int(group)
except:
break
else:
print(num)
total = total+num
count = count+1
strg = strg[index+1:]
print(count)
avg = total/count
print(name+", average:", avg)
输入：Neda:90,80,70,90,50 John:80,100,30 Mary:20,100,90,80
我的输出：
90
80
70
90
50
5
Neda, average: 76.0
80
10
2
John, average: 45.0
20
10
2
Mary, average: 15.0
预期输出：
90
80
70
90
50
5
Neda, average: 76.0
80
100
30
3
John, average: 70.0
20
100
90
80
4
Mary, average: 72.5