python列表命令

创建普通列表：member;； 创建混合列表：mix； 创建空列表：empty  

>>> member = ['lala','oo']
>>> member
['lala', 'oo']
>>> member.append('jjj')
>>> member
['lala', 'oo', 'jjj']
>>> len(member)
3
>>> member.extend(['xx','pp'])
>>> member
['lala', 'oo', 'jjj', 'xx', 'pp']
>>> len	(member )
5
>>> member .insert(0,'ll')
>>> member
['ll', 'lala', 'oo', 'jjj', 'xx', 'pp']
>>> 

　　

append（）只能添加一个

extend() 扩展一个列表

insert（）排列或插入，排序要从0开始

 

从列表中获取元素

通过元素的索引值（index）从列表中获取单个元素，从0开始

用temp可以改变位置

>>> member
['ll', 'lala', 'oo', 'jjj', 'xx', 'pp']
>>> member [0]
'll'
>>> temp  = member [0]>>> member [0] = member [1]
>>> member
['lala', 'lala', 'oo', 'jjj', 'xx', 'pp']
>>> member [1] = temp
>>> member
['lala', 'll', 'oo', 'jjj', 'xx', 'pp']
>>> 

从列表删除元素

1：remove()

2：del 

3：pop() 从列表中取出一个元素

>>> member
['lala', 'll', 'oo', 'jjj', 'xx', 'pp']
>>> member.remove ('ll')
>>> member
['lala', 'oo', 'jjj', 'xx', 'pp']>>> del member [1]
>>> member
['lala', 'jjj', 'xx', 'pp']
>>> member .pop()
'pp'
>>> member
['lala', 'jjj', 'xx']
>>> name = member .pop()
>>> name
'xx'
>>> member
['lala', 'jjj']
>>> member .pop(1)
'jjj'
>>> member
['lala']

利用列表分片：slice

>>> member [1:3]

1代表开始，3代表结束 0：可以不用写 最后也可以不用写，  都不写可以拷贝文件

>>> member
['小耿哥', '耿哥 ', 'lala', 'haha']
>>> member [1:3]
['耿哥 ', 'lala']
>>> member
['小耿哥', '耿哥 ', 'lala', 'haha']
>>> member [:3]
['小耿哥', '耿哥 ', 'lala']
>>> member [:]
['小耿哥', '耿哥 ', 'lala', 'haha']
>>> member2 = member [:]
>>> member2
['小耿哥', '耿哥 ', 'lala', 'haha']

 

列表常用操作符

1：比较操作符

2：逻辑操作符

3：连接操作符

4：重复操作符

5：成员关系操作符

>>> list1 = [123,234]
>>> list2 = [345,456]
>>> list1 > list2
False
>>> list3 = [123,234]
>>> (list1 < list2) and (list1 == list3)
True
>>> list4 = list1 + list3
>>> list4
[123, 234, 123, 234]
>>> 不能添加新元素
>>> list3 * 3
[123, 234, 123, 234, 123, 234]
>>> list3 *= 3
>>> list3
[123, 234, 123, 234, 123, 234]
>>> 123 in list3
True
>>> list5 = [123,['小耿哥'],456]
>>> '小耿哥' in list5[1]
True
>>> '用索引号去访问列表的值'
'用索引号去访问列表的值'
>>> list5[1][0]
'小耿哥'

 

列表的小伙伴

count：计算参数在列表的次数

index：索引

reverse：逆行

sort：指定方式排序

>>> list3.count(123)
3
>>> list3.index(123)
0
>>> list3.index(123,3,7)
4
>>> list3.reverse()
>>> list3
[234, 123, 234, 123, 234, 123]
>>> list6 = [4,3,6,4,98,54,54,41]
>>> list6.sort()
>>> list6.sort()
>>> list6]
SyntaxError: invalid syntax
>>> list6
[3, 4, 4, 6, 41, 54, 54, 98]
>>> list6.sort(reverse=True)
>>> list6
[98, 54, 54, 41, 6, 4, 4, 3]

 

元组：不可以被修改

元组跟列表很相似

>>> tuple1 = (1,2,3,4,5,6,7,8)
>>> tuple1
(1, 2, 3, 4, 5, 6, 7, 8)
>>> tuple1[1]
2
>>> tuple1[5:]
(6, 7, 8)
>>> tuple2 = tuple1[:]
>>> tuple2
(1, 2, 3, 4, 5, 6, 7, 8)
>>> temp = (1)
>>> temp
1
>>> temp2 = 2,3,4
>>> type(temp2)
<class 'tuple'>
>>> type(temp)
<class 'int'>
>>> 8 * (8)
64
>>> 8 * (8,)
(8, 8, 8, 8, 8, 8, 8, 8)
>>> '跟逗号有关'
'跟逗号有关'
>>> temp = ('小耿哥','古风歌','耿哥','哈哈啊')
>>> temp
('小耿哥', '古风歌', '耿哥', '哈哈啊')
>>> temp = temp[:2] + ('啦啦',) + temp[2:]
>>> temp
('小耿哥', '古风歌', '啦啦', '耿哥', '哈哈啊')