金額を出すときなんかに3桁ごとにコンマ入れるよね。
# -*- coding: utf-8 -*- import sys def num(): arg = sys.argv[1] leng = len(arg) hako = [] st = "" for i in arg: hako.append(i) lista = hako if leng % 3 == 0: for i in range(2,leng,3): konma = lista[i]+"," lista[i] = konma for i in lista: st+=i elif leng % 5 == 0: for i in range(1,leng,3): konma = lista[i]+"," lista[i] = konma for i in lista: st+=i elif leng % 8 == 0: for i in range(1,leng,3): konma = lista[i]+"," lista[i] = konma for i in lista: st+=i else: for i in range(0,leng,3): konma = lista[i]+"," lista[i] = konma for i in lista: st+=i print st.rstrip(",") if __name__ == '__main__': num()