sep Seperator, between the arguments to print() function. print('naver','kakao','samsung',sep=';') >>> naver;kakao;samsung print('naver','kakao','sk','samsung',sep='/') >>> naver/kakao/sk/samsung end= It can be put anything in end, then it will be following. '\n\ is the default. print("first",end=' ');print("second") >>> first second ; : Multiple command in one line. replace string.replace(old,n..