题解 | 添加逗号
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
number = input()
numberlist = str(number)[::-1]
qianfenwei = []
for i in range(len(numberlist)):
if i % 3 == 0 and i != 0:
qianfenwei.append(',')
qianfenwei.append(numberlist[i])
qianfenwei = qianfenwei[::-1]
for i in range(len(qianfenwei)):
print(qianfenwei[i], end='')
