（2）python变量类型

声明： 仅为学习笔记，无任何意义 。

列表：

>>>> list1=['字符',"字符串",110,1.0125]

>>> list1;type(list1);len(type1)

['字符', '字符串', 110, 1.0125]

<class 'list'>

4

>>>> list1[0];list1[1];list1[2];list1[3]

'字符'

'字符串'

110

1.0125

>>>> list1[0]=999;list1[2]='字符'

>>> list1

[999, '字符串', '字符', 1.0125]

</span>

>>>> list1=list1*2

>>> len(list1)

8

>>>> list1=list1+[1,2,3,4,5]

>>> list1

['字符', '字符串', 110, 1.0125, 1, 2, 3, 4, 5]

>>> list1[:]

['字符', '字符串', 110, 1.0125, 1, 2, 3, 4, 5]

>>> list1[0:]

['字符', '字符串', 110, 1.0125, 1, 2, 3, 4, 5]

>>> list1[1:]

['字符串', 110, 1.0125, 1, 2, 3, 4, 5]

>>> list1[0:1]

['字符']

>>> list1[2:5]

[110, 1.0125, 1]

>>> list1[-1]

5

>>> list1[-3]

3

>>> list1[-1:3]

[]

>>> list1[-3:-5]

[]

</span>

元组：

>>>> tup1=()

>>> tup1

()

>>> tup1=(1,2,3,44,12)

>>> tup1;type(tup1);len(tup1)

(1, 2, 3, 44, 12)

5

注：无法自定义元素。

>>>> tup1[1]

2

>>> tup[1]="ooo"

Traceback (most recent call last):

File "<pyshell#471>", line 1, in <module>

tup[1]="ooo"

NameError: name 'tup' is not defined

字典：

<span style="font-family:Microsoft YaHei;">>>> dirr={}

>>> dirr[0]=list1

>>> dirr[2]=tup1

>>> dirr

{0: ['字符', '字符串', 110, 1.0125, 1, 2, 3, 4, 5], 2: (1, 2, 3, 44, 12)}</span>

>>>> len(dirr)

2

>>> dirr[1]=12

>>> dirr

{0: ['字符', '字符串', 110, 1.0125, 1, 2, 3, 4, 5], 1: 12, 2: (1, 2, 3, 44, 12)}

>>> dirr[0]="gai"

>>> dirr

{0: 'gai', 1: 12, 2: (1, 2, 3, 44, 12)}

>>> dirr["插入"]="任意"

>>> dirr[4]=""

>>> dirr[4]

>>>> dirr["A"]="BOB"

>>> dirr

{0: 'gai', 1: 12, 2: (1, 2, 3, 44, 12), 4: '', '插入': '任意', 'A': 'BOB'}

>>> dirr[10]=11000

</span>

>>>> dirr

{0: 'gai', 1: 12, 2: (1, 2, 3, 44, 12), 4: '', '插入': '任意', 10: 11000, 'A': 'BOB'}