列表的使用（包括copy和deepcopy）
列表的切片
names = ["张三","李四","王五","隔壁老王"]
print(names[0],names[2]) #张三 王五
print(names[1:3]) #['李四', '王五']
print(names[-2:]) #['王五', '隔壁老王']
print(names[0:3]) #['张三', '李四', '王五']
列表添加数据
names = ["张三","李四","王五","隔壁老王"]
names.append("小东")
print(names) #['张三', '李四', '王五', '隔壁老王', '小东']
列表的insert
names = ["张三","李四","王五","隔壁老王"]
names.insert(1,"xiaolei") #['张三', 'xiaolei', '李四', '王五', '隔壁老王']
names.insert(3,"wei") #['张三', '李四', '王五', 'wei', '隔壁老王']
print(names)
列表的删除元素
方法一
names = ["张三","李四","王五","隔壁老王"]
names.pop(1)
print(names)
方法二
del names[1]
print(names)
方法三
names.remove("张三")
print（names）
列表元素的修改
names = ["张三","李四","王五","隔壁老王"]
names[2] = "xiaolei"
print(names)
列表的反序
names = ["张三","李四","王五","隔壁老王"]
names.reverse()
print(names)
列表的元素统计
names = ["张三","李四","王五","隔壁老王","李四","王五"]
print(names.count("王五")) # 2
列表deepcopy和copy
copy
import copy
names = ["张三","李四",["alex","jack"],"王五","隔壁老王"]
name2 = copy.copy(names)
names[1] = "xiaolei"
names[2][0] = "WORD"
print(names,"\n",name2)
运行结果
deepcopy
import copy
names = ["张三","李四",["alex","jack"],"王五","隔壁老王"]
name2 = copy.deepcopy(names)
names[1] = "xiaolei"
names[2][0] = "WORD"
print(names,"\n",name2)
运行结果
添加解释
如果copy.copy拷贝的是元组，那么他不会进行浅拷贝，仅仅是指向。
原因：因为元组是不可变类型，那么意味着数据一定不能修改，因此用copy.copy的时候他会自动判断，是元组时自动指向它。