1、不指定开始和结束的索引[:]，这样得到的切片就可以包含整个列表，然后给切片一个新的变量，从而实现复制列表。
2、创建原始列表的副本，两个列表的操作不会影响。
names = ["Jerry", "Tom"]
names_copy = names[:]
names.append("Ann")
names_copy.append("Bob")
print(f"names：{names}")
print(f"names_copy：{names_copy}")
# output:
# names：['Jerry', 'Tom', 'Ann']
# names_copy：['Jerry', 'Tom', 'Bob']
Python学习笔记之列表切片代码示例
"""切片"""
pepole = ["koulong","liding","ceshi","xiaohong"]
print(pepole[0:1])
print(pepole[:2])
print(pepole[-1:])
#访问所有元素的切片
for people in pepole[0:1]:
print(people.title())
#复制切片
my_foods = ["香蕉","苹果","梨子"]
my_friend_foods = my_foods[0:2]
print("我最喜欢的水果：" + str(my_foods))
print("我最喜欢的水果分别是：")
for my_foods1 in my_foods:
print(my_foods1)
print("我朋友最喜欢的水果：" + str(my_friend_foods))
print("我朋友最喜欢的水果分别是")
for my_friend_foods1 in my_friend_foods:
print(my_friend_foods1)
my_friend_foods.append("葡萄")
print("我朋友最喜欢的水果：" + str(my_friend_foods))
my_friend_foods2 = my_friend_foods.remove("葡萄")
my_friend_foods.append("西瓜")
print(my_friend_foods)
#动手练一练
my_foods.append("芒果")
print("我最喜欢的前2个水果：" + str(my_foods[0:2]))
print(my_foods)
print("我最喜欢的四个水果中的中间2个水果：" + str(my_foods[1:3]))
print("我最喜欢的最后三个水果：" + str(my_foods[1:4]))
