PAT 1001 A+B Format python解法

题目
1001 A+B Format （20 分）
Calculate a+b and output the sum in standard format – that is, the digits must be separated into groups of three by commas (unless there are less than four digits).

Input Specification:
Each input file contains one test case. Each case contains a pair of integers a and b where −10​6​​≤a,b≤10​6​​. The numbers are separated by a space.

Output Specification:
For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.

Sample Input:
-1000000 9

Sample Output:
-999,991

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大概题意

• 就是计算a+b的和，然后格式化输出（就是从最后一位往前开始算，每3位数字加一个逗号。）

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解题思路

• 提到格式化输出，直接用format函数。
• format有一个千位分隔符的用法，正好和题意一样，就是每3位数字加一个逗号。

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Code

a,b = map(int,input().split())
print('{:,}'.format(a+b))

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运行结果