题解 | 添加逗号
添加逗号
https://www.nowcoder.com/practice/f51c317e745649c0900996fd3f683aed
# 添加逗号
exm = input()
exm = [ch for ch in exm]
# print(exm)
ji = 1
biao = len(exm) - 1
while biao > 0:
#print(biao)
if ji == 3:
# print('进入'+str(biao))
exm.insert(biao, ",")
# print(exm)
ji = 1
biao = biao - 1
else:
biao = biao - 1
ji = ji + 1
exm = "".join(exm)
print(exm)
