컬렉션 자료형의 내장메소드 append(), extend(), insert() a.insert(len(a), x) 는 a.append(x) 와 동등 my_list=[] for i in range(100, 250): if (i%7==0) and (i%5!=0): my_list.append(str(i)) print(','.join(my_list)) # 112,119,126,133,147,154,161,168,182,189,196,203,217,224,231,238 my_list=[] for i in range(100, 250): if (i%7==0) and (i%5!=0): my_list.insert(len(my_list), str(i)) print(','.join(my_list)) # 112,119,126..