python中的列表

朱雀 2021-12-14 13:47 388阅读 0赞

## 1.列表的创建 ##

列表里可以存储不同的数据类型

li = [1,1.5,'hello',True]
    print(li)
    print(type(li))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70]  
列表里也可以嵌套列表（列表也是一种数据类型）

li1 = [1,1.5,'hello',True,[1,2,3,4,5]]
    print(li1)
    print(type(li1))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 1]

## 2.列表的特性 ##

1.索引

service = ['http','ssh','ftp']
    
    #索引
    print(service[0])
    print(service[-1])

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 2]  
2.切片

#切片
    print(service[1:])
    print(service[:-1])
    print(service[::-1])

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 3]  
3.重复

#重复
    print(service * 3)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 4]  
4.连接

# 连接
    service1 = ['nfs','samba']
    print(service + service1)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 5]  
5.成员操作符

service1 = ['nfs','samba']
    #成员操作符
    print('nfs' in service)
    print('nfs' in service1)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 6]  
6.迭代（for循环遍历）

service = ['http','ssh','ftp']
    for i in service:
        print(i)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 7]  
7.列表的嵌套

#列表里嵌套列表
    service2 = [['http','80'],['ssh','22'],['ftp','21']]
    print (service2)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 8]  
1.索引  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 9]  
2.切片  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 10]  
练习：  
1.输入月份，判断季节。

month = int(input('Month:'))
    if month in [3,4,5]:
        print('春季')
    elif month in [6,7,8]:
        print('夏季')
    elif month in [9,10,11]:
        print('秋季')
    elif month in [12,1,2]:
        print('冬季')
    else:
        print('请输入正确值：')

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 11]  
2.输入日期，判断是这年的第几天。

time = input('请输入日期 YYYY-MM-DD：')
    date = time.split('-')
    year = int(date[0])
    month = int(date[1])
    day = int(date[2])
    
    li = [31,28,31,30,31,30,31,31,30,31,30,31]
    num = 0
    
    if ((year % 4 ==0) and (year % 100 != 0) or (year % 400 == 0)):
        li[1] = 29
    for i in range(12):
        if month > i + 1:
            num += li[i]
        else:
            num += day
            break
    print('这一天是%d年的第%d天' %(year,num))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 12]  
3.假定有下面的列表：names = \[‘fentiao’,‘fendai’,‘fensi’,‘apple’\]。要求：输出结果为：‘I have fentiao,fendai,fensi and apple.’

names = ['fentiao','fendai','fensi','apple']
    print('I have ' +','.join(names[:-1]) + ' and ' + names[-1])

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 13]

## 3.列表的增加 ##

**方法1：使用列表的连接特性**

service = ['http','ssh','ftp']
    print(service + ['firewalld'])

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 14]  
**方法2.append:追加，追加一个元素到列表中**

service = ['http','ssh','ftp']
    service.append('firewalld')
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 15]  
**方法3…extend:拉伸 追加多个元素到列表中**

service = ['http','ssh','ftp']
    service.extend(['mysql','firewalld'])
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 16]  
**方法4.insert:在指定索引位置插入元素**

service = ['http','ssh','ftp']
    service.insert(1,'samba')
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 17]

## 4.列表的删除 ##

**方法1.使用pop删除列表**

service=['http','ssh','ftp']
    service.pop()
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 18]  
注意：pop命令默认的是删除最后一个，而且删除之后依旧可以进行查看。

删除指定的位置元素

service = ['http','ssh','ftp']
    print(service.pop(1))
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 19]  
**方法2.remove:删除指定的元素**

service = ['http','ssh','ftp']
    a = service.remove('ssh')
    print(type(a))
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 20]注意：  
1.结果中之所以变量a的类型是NoneType，是因为其ssh被彻底删除了，没有任值  
2.remove命令是指彻底删除列表中某一个元素

**方法3.del彻底删除**

service = ['http','ssh','ftp']
    print(service)
    del service
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 21]注意：执行python程序后会出现NameErrot报错，是因为service列表已经被彻底删除了

## 4.列表的修改 ##

方法1.通过索引，重新赋值

service = ['http','ssh','ftp']
    print(service)
    service[0] = 'mysql'
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 22]  
方法2.通过切片

service = ['http','ssh','ftp']
    print(service)
    print(service[:2])
    service[:2] = ['samba','iscsi']
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 23]

## 5.列表的查看 ##

查看出现的次数

service = ['ssh','http','ssh','ftp']
    print(service.count('ssh'))

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 24]查看指定元素的索引值

service = ['ssh','http','ssh','ftp']
    print(service.index('ssh'))
    print(service.index('ssh',0,3))       ##索引范围

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 25]注意：这里的索引值是第一次出现的索引值

## 6.列表中字符的排序 ##

1.对字符进行排序

service = ['ftp','ssh','ftp','dns']
    service.sort()
    print(service)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 26]  
注意：字符依据ASCII码进行从小到大的排序，而且不区分大小写。

2.对数字进行排序

li = list(range(10))
    print(li)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 27]  
3.将列表打乱

import random
    li = list(range(10))
    print(li)
    random.shuffle(li)
    print(li)
    random.shuffle(li)
    print(li)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 28]  
练习：  
1.用户登陆  
要求：  
1.系统里面有多个用户，用户的信息目前保存在列表里面  
users = \[‘root’,‘westos’\]  
passwd = \[‘123’,‘456’\]  
2.用户登陆(判断用户登陆是否成功  
1).判断用户是否存在  
2).如果存在  
1).判断用户密码是否正确  
如果正确，登陆成功，推出循环  
如果密码不正确，重新登陆，总共有三次机会登陆  
3).如果用户不存在  
重新登陆，总共有三次机会

users = ['root','westos']
    passwds = ['123','456']
    trycount = 0
    
    while trycount < 3:
        inuser = input('用户名: ')
        inpasswd = input('密码: ')
        trycount += 1
        if inuser in users:
            index = users.index(inuser)
            passwd = passwds[index]
            if inpasswd == passwd:
                print('%s用户登录成功' %inuser)
                break
            else:
                print('%s登录失败：密码错误' %inuser)
        else:
            print('%s用户不存在' %inuser)
    else:
        print('尝试超过3次，请稍后...')

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 29]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 30]  
![在这里插入图片描述][20190704193337718.png]  
用户登陆进阶

1.  后台管理员 admin 密码：admin
2.  管理员才能看到会员信息
3.  会员信息包含  
    添加会员信息  
    删除会员信息  
    查看会员信息  
    退出

print('管理员登录'.center(50,'*'))
    inuser = input('UserName: ')
    inpasswd = input('Password: ')
    
    users = ['root','westos']
    passwds = ['123','456']
    
    if inuser == 'admin' and inpasswd == 'admin':
        print('管理员登录成功')
        print('会员管理'.center(50,'*'))
        while True:
            print("""
                菜单
            1.  添加会员信息
            2.  删除会员信息
            3.  查看会员信息
            4.  退出
            """)
            choice = input('请输入您的选择: ')
            if choice == '1':
                print('添加会员信息'.center(50,'*'))
                addUser = input('添加会员名: ')
                if addUser in users:
                    print('%s用户已经存在' %addUser)
                else:
                    addPasswd = input('密码: ')
                    users.append(addUser)
                    passwds.append(addPasswd)
                    print('%s用户添加成功' %addUser)
    
            elif choice == '2':
                print('删除会员信息'.center(50,'*'))
                delUser = input('删除会员名: ')
                delIndex = users.index(delUser)
                users.remove(delUser)
                passwds.pop(delIndex)
                print('%s会员删除成功' %delUser)
    
            elif choice == '3':
                print('查看会员信息'.center(50, '*'))
                print('\t用户名\t密码')
                userCount = len(users)
                for i in range(userCount):
                    print('\t%s\t%s' %(users[i],passwds[i]))
    
            elif choice == '4':
                exit()
            else:
                print('请输入正确选择！')
    else:
        print('管理员登录失败...')

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 31]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 32]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 33]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 34]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 35]

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