줄기세포

문제 숫자타입이 아니면 에러 3자리마다 콤마 찍기 코드(Code) def commathree(): num = '' while True: try: num = int(input("please enter number type: ")) num = str(num) break except ValueError: print("not a number type!") print(ValueError) for i in range(0,len(num)): print(num[i],end='') if (len(num)-i)%3== 1 and i !=len(num)-1: print(',',end='') else: continue print() 함수 실행 >>> commathree() please enter number type: 99 ..