题解 | 添加逗号
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
def format_number(n):
num_str = str(n)
if len(num_str) <= 3:
return num_str
format_str = []
for i in range(len(num_str),0,-3):
format_str.append(num_str[max(i-3,0):i])
return ",".join(format_str[::-1])
n = int(input())
# 输出结果
print(format_number(n))
