classmate = ['mm', 'll', 'ff']
classmate.append('kate')
print(classmate)
classmate.insert(2, 'hanmeimei')
print(classmate)
print(classmate.pop(3))
print(classmate)

always_classmate = ('maclxf', 'kate', 'bake')
print(always_classmate)
print(('maclxf'))