zoukankan      html  css  js  c++  java
  • list类型功能剖析

     append  向后追加

    1 name_list=["eirc","alex","tony"]
    2 name_list.append('seven')
    3 print(name_list)
    4 #输出结果['eirc', 'alex', 'tony', 'seven']

    count  计算元素出现次数

    1 name_list=["eirc","alex","tony"]
    2 name_list.append('seven')
    3 name_list.append('seven')
    4 name_list.append('seven')
    5 name_list.append('seven')
    6 print(name_list.count('seven'))
    7 
    8 #输出结果 4

    extent 扩展(批量添加)

    # iterable 可迭代的

    1 name_list=["eirc","alex","tony"]
    2 name_list.append('seven')
    3 name_list.append('seven')
    4 name_list.append('seven')
    5 name_list.append('seven')
    6 print(name_list.count('seven'))
    7 temp=[111,222,33,44]
    8 name_list.extend(temp)
    9 print(name_list)
    #输出结果

      4
      ['eirc', 'alex', 'tony', 'seven', 'seven', 'seven', 'seven', 111, 222, 33, 44]

    index  获取指定元素的索引

    1 name_list=["eirc","alex","tony"]
    2 name_list.append('seven')
    3 print(name_list.index("alex"))
    4 #输出结果 1

    insert 向指定索引插入元素

    1 name_list=["eirc","alex","tony"]
    2 name_list.insert(1,'SEVEN')
    3 #在索引值为1的位置插入SEVEN
    4 print(name_list)
    5 #输出结果['eirc', 'SEVEN', 'alex', 'tony']

    pop 在原list中移除列表尾部,并且可以将其赋值给其他变量

    1 name_list=["eirc","alex","tony"]
    2 i = name_list.pop()
    3 print(i)
    4 print(name_list)
    5 #输出结果tony
    6 ['eirc', 'alex']

    remove  在list中移除某个元素(从左边找到的第一个元素)

    1 name_list=["eirc","alex","tony"]
    2 name_list.remove("tony")
    3 print(name_list)
    4 #输出结果
    5 ['eirc', 'alex']

    reverse 将list中的元素翻转

    1 name_list=["eirc","alex","tony"]
    2 name_list.reverse()
    3 print(name_list)
    4 #输出结果['tony', 'alex', 'eirc']

    sort  排序

    1 name_list=["eirc","alex","tony"]
    2 name_list.sort()
    3 print(name_list)
    4 #输出结果['alex', 'eirc', 'tony']

    del 删除指定位置的元素(也可以执行切片删除)

    1 name_list=["eirc","alex","tony"]
    2 del name_list[1]
    3 print(name_list)
    4 #输出结果['eirc', 'tony']
    1 name_list=["eirc","alex","tony","seven"]
    2 del name_list[1:3]
    3 print(name_list)
    4 #输出结果['eirc', 'seven']
  • 相关阅读:
    linux 声音大小调整的命令
    Linux下cron的使用
    MySql中添加用户,新建数据库,用户授权,删除用户,修改密码
    yii 删除内容时增加ajax提示
    git 忽略权限
    yii CGridView colum 链接
    yii cgridview 对生成的数据进行分页
    yii cgridview 默认的筛选如何做成选择框
    db2 Reorgchk:重组检查,是否需要重组
    Linux 下文件
  • 原文地址:https://www.cnblogs.com/zyqy/p/9241105.html
Copyright © 2011-2022 走看看