1.列表的表现形式

[1,2,3,4,5]
['a','b','c','d']

2.用下标取得单个值

>spam = ['a','b','c','d']
>spam[0]
'a'
注意：下标为整数，否则出现报错，
>spam = [['a','b','c','d'],[1,2,3,4,5]]
>spam[1][4]
>5

3.负数下标

>spam = ['a','b','c','d']
>spam[-1]
'd'
>spam[-2]
'c'

4.利用切片取子列表

>spam = ['a','b','c','d']
>spam[0:4]
'a,','b','c','d'
>spam[0:3]
'a,','b','c'

5.利用len()语句取的列表长度

>spam = ['a','b','c','d']
>len(spam)
4

6.利用下标改变列表中的值

>spam = ['a','b','c','d']
>spam[0] = 'k'
>spam
['k,','b','c','d']

7.列表的连接和复制

>['a','b','c','d'] + [1,2,3]
['a','b','c','d',1,2,3]

>spam = ['a','b','c','d']
>spam = spam +[2,3,4]
['a','b','c','d',2,3,4]

>spam = [1,2,3]
>spam *3
[1,2,3,1,2,3,1,2,3]

8.del语句删除列表中的值

>spam = ['a','b','c','d']
>del spam[0]
>spam
['b','c','d']

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