Python

列表操作知识
<1> 变量输出

names = "Mayun Mahuateng Liuqiangdong Liyanhong Renzhengfei"
names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
print(names)
print(names2)

<2>列表增加变量值

names = "Mayun Mahuateng Liuqiangdong Liyanhong Renzhengfei"
names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
names2.append("Wangxing")
print(names)
print(names2)

<3> 列表中插入变量

names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
names2.insert(1,"Leijun")
names2.insert(3,"Dongmingzhu")
print(names2)

<4> 修改列表中变量值

names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
names2 [2] ="张瑞敏"
print(names2)

<5>删除列表中的值

names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
names2.remove("Mahuateng")
print(names2)

names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
#names2.remove("Mahuateng")
del names2[1]
print(names2)

names2 = ["Mayun","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
#names2.remove("Mahuateng")
#del names2[1]
names2.pop(1)
print(names2)

<6>查找变量值

names = "Mayun Mahuateng Liuqiangdong Liyanhong Renzhengfei"
names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
print(names.index("Liuqiangdong"))# 查找值位置
print(names2.index("Mahuateng"))#查找数组位置
print(names.count("Liuqiangdong"))#查找相同变量

<7>列表清除变量值

names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
names2.clear()
print(names2)

<8>列表反转和排序

#names = "Mayun Mahuateng Liuqiangdong Liyanhong Renzhengfei"
names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong","Eric","jack","Liyanhong","Renzhengfei"] #定义列表
#names2.clear()
names2.reverse()#列表反转
print(names2)
names2.sort()#列表排序
print(names2)

<9>列表扩展

names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong","Eric","jack","Liyanhong","Renzhengfei"] #定义列表
names3 =[1,2,3,4]
names2.extend(names3)
print(names2,names3)

<10>取列表中的值

names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong","Eric","jack","Liyanhong","Renzhengfei"] #定义列表
print(names2[0],names2[4])#取值
print(names2[1:3])#顾头不顾尾，切片，取第2,3两位
print(names2[-1])#从后边开始取值，取最后一位值
print(names2[-1:-3])#从后边开始取值，取值为空，即取不出值
print(names2[-3:-1])#切片只能从左向右取值
print(names2[-2:])#取后两位，-1可以省略
print(names2[0:3])#取前三位

<11>深浅copy

import copy
names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
names3 = copy.deepcopy(names2)#深copy
names2[2] ="王思聪"
print(names2)
print(names3)

names3 = names2#浅copy
names2[2] ="王健林"
print(names2)
print(names3)

<12>for语句取值

names2 = ["Mayun","Liuqiangdong","Mahuateng","Liuqiangdong",["Eric","jack"],"Liyanhong","Renzhengfei"] #定义列表
#range(1,10,2)#范围（开始位置，总长度，步长）
for i in names2:
    print(i)

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