a = "hello" print(type(a)) a = 10 print(type(a)) print(id(a)) a = a + 1 print(id(a)) # immutable a = [1,2,3] print(id(a)) a.append(4) print(a) print(id(a)) a = 1,2,3 a = 1, [2,3], [4,5] a[1].append(4) print(a) # why