my_list = ['a','b'] my_list.append('c') print(my_list) # ['a','b','c'] other_list = [1,2] my_list.append(other_list) print(my_list) # ['a','b','c',[1,2]] my_list.extend(other_list) print(my_list) # ['a','b','c',[1,2],1,2]