列表的使用

切片：不管怎么切，都是从左到右的

names = ["zhangyang","guyun","xiangpeng","xuliangchen"]
# print(names)
# print(names[1:3]) #切片
print(names[-3:-1])  

增加 append  insert ，修改 names[2] = "xiedi"

names = ["zhangyang","guyun","xiangpeng","xuliangchen"]
names.append("leihaidong")  #append方法在后面追加
names.insert(1,"chenronghua")  #insert方法，1代表你想插入的位置，后面接上要插入的内容
names.insert(3,"xinzhiyu")

names[2] = "xiedi"  # 修改

print(names)

删除 names.remove   del names[1]   names.pop(1)

# names.remove("chengronghua")
del names[1] = names.pop(1)
names.pop()  #默认删除最后一个数，加下标就是删除该位置的数

 其他方法

names = ["zhangyang","guyun","xiangpeng","chenronghua","xuliangchen"]
names.append("leihaidong")  #append方法在后面追加
names.insert(1,"chenronghua")  #insert方法，1代表你想插入的位置，后面接上要插入的内容
names.insert(3,"xinzhiyu")
names[2] = "xiedi"  # 修改
print(names)

print(names.index("xiedi"))   #index方法是查找索引
print(names.count("chenronghua"))   #统计chenronghua出现的次数
#names.clear()  #清空
#names.reverse()  #翻转
print(names)
names2 = [1,2,3,4]
names.extend(names2)   #extend 合并
print(names)

 

浅拷贝: 只拷贝第一层列表，第二层的就不拷贝

names = ["4zhangyang","#!guyun","xxiangpeng",["alex","jack"],"chenronghua","xuliangchen"]

name2 = names.copy()
print(names)
print(name2)
names[2] = "向鹏"
names[3][0] = "alexander"
print(names)
print(name2)

 输出结果：

['4zhangyang', '#!guyun', 'xxiangpeng', ['alex', 'jack'], 'chenronghua', 'xuliangchen']
['4zhangyang', '#!guyun', 'xxiangpeng', ['alex', 'jack'], 'chenronghua', 'xuliangchen']
['4zhangyang', '#!guyun', '向鹏', ['alexander', 'jack'], 'chenronghua', 'xuliangchen']
['4zhangyang', '#!guyun', 'xxiangpeng', ['alexander', 'jack'], 'chenronghua', 'xuliangchen']

 

深拷贝: 完全克隆

import copy  #调用copy模块
names = ["4zhangyang","#!guyun","xxiangpeng",["alex","jack"],"chenronghua","xuliangchen"]
name2 = copy.deepcopy(names)   #深拷贝方法，完全克隆names

print(names)
print(name2)
names[2] = "向鹏"
names[3][0] = "alexander"
print(names)
print(name2)

输出结果:

['4zhangyang', '#!guyun', 'xxiangpeng', ['alex', 'jack'], 'chenronghua', 'xuliangchen']
['4zhangyang', '#!guyun', 'xxiangpeng', ['alex', 'jack'], 'chenronghua', 'xuliangchen']
['4zhangyang', '#!guyun', '向鹏', ['alexander', 'jack'], 'chenronghua', 'xuliangchen']
['4zhangyang', '#!guyun', 'xxiangpeng', ['alex', 'jack'], 'chenronghua', 'xuliangchen']

 

 列表的步长切片，列表的循环：

names = ["4zhangyang","#!guyun","xxiangpeng",["alex","jack"],"chenronghua","xuliangchen"]
print(names[0:-1:2])  #步长切片，默认为1
print(names[::2])   #可以省略写，只写步长



for i in names:
    print(i)