my_foods = ['pizza', 'falafel', 'carrot cake']
#复制列表
friend_foods = my_foods[:]

print(my_foods)
print(friend_foods)

#在对应的列表中添加元素，不会影响复制的列表
my_foods.append('cannoli')
friend_foods.append('ice cream')

print(my_foods)
print(friend_foods)