Home Backend Development Python Tutorial How to use and differentiate between lists and tuples in Python

How to use and differentiate between lists and tuples in Python

Feb 28, 2017 pm 04:54 PM

1. The difference between the two

List:

1. You can add the list content append

2. You can count a certain The number of times the list segment appears in the entire list count

3. You can insert a string and split each letter of the entire string as a list segment and append it to the listextedn

4. You can query the position index of a certain list segment in the entire list

5. You can insert a list segment at the specified position insert

6. You can delete the last list segment of the list pop

7. You can delete a certain list segment in the specified list remove

8. You can sort forward and reverse reverse

9. You can sort by letters or numbers sort

10. Use square brackets "[]"

when defining the list. Note : In the list, if two list segments are the same, whether using index or remove, the top list segment will be counted

Tuple:

1. You can count the number of times a certain tuple segment appears in the entire tuple count

2. You can query the tuple number index
# of a certain tuple segment in the entire tuple.

##3. Use parentheses "()" when defining tuples


2. How to use the two


List


#定义列表
>>> name_list = ['sean','tom','jack','Angelia','Daisy','jack'] 
#查看定义的列表
>>> name_list
['sean', 'tom', 'jack', 'Angelia', 'Daisy', 'jack']
#增加david列表段
>>> name_list.append('david')
>>> name_list
['sean', 'tom', 'jack', 'Angelia', 'Daisy', 'jack', 'david']
#统计david列表段出现次数
>>> name_list.count('david')
1
>>> name_list.count('jack')
2
#使用extend向列表中增加列表段
>>> name_list.extend('Hello,My name is sean')
>>> name_list
['sean', 'tom', 'jack', 'Angelia', 'Daisy', 'jack', 'david', 'H', 'e', 'l', 'l', 'o', ',', 'M', 'y', ' ', 'n', 'a', 'm', 'e', ' ', 'i', 's', ' ', 's', 'e', 'a', 'n']
#查看列表段所在的索引号,注意这里统计的jack为第一个jack id号
>>> name_list.index('jack')
2
>>> name_list.index('tom')
1
#向索引号为2的地方插入Adam
>>> name_list.insert(2,'Adam')
>>> name_list
['sean', 'tom', 'Adam', 'jack', 'Angelia', 'Daisy', 'jack', 'david', 'H', 'e', 'l', 'l', 'o', ',', 'M', 'y', ' ', 'n', 'a', 'm', 'e', ' ', 'i', 's', ' ', 's', 'e', 'a', 'n']
#删除最后一个列表段
>>> name_list.pop()
'n'
>>> name_list
['sean', 'tom', 'Adam', 'jack', 'Angelia', 'Daisy', 'jack', 'david', 'H', 'e', 'l', 'l', 'o', ',', 'M', 'y', ' ', 'n', 'a', 'm', 'e', ' ', 'i', 's', ' ', 's', 'e', 'a']
#删除指定列表段,注意这里删除的是第一个jack
>>> name_list.remove('jack')
>>> name_list
['sean', 'tom', 'Adam', 'Angelia', 'Daisy', 'jack', 'david', 'H', 'e', 'l', 'l', 'o', ',', 'M', 'y', ' ', 'n', 'a', 'm', 'e', ' ', 'i', 's', ' ', 's', 'e', 'a']
#对整个列表进行倒序
>>> name_list.reverse()
>>> name_list
['a', 'e', 's', ' ', 's', 'i', ' ', 'e', 'm', 'a', 'n', ' ', 'y', 'M', ',', 'o', 'l', 'l', 'e', 'H', 'david', 'jack', 'Daisy', 'Angelia', 'Adam', 'tom', 'sean']
#对整个列表进行倒序
>>> name_list.reverse()
>>> name_list
['sean', 'tom', 'Adam', 'Angelia', 'Daisy', 'jack', 'david', 'H', 'e', 'l', 'l', 'o', ',', 'M', 'y', ' ', 'n', 'a', 'm', 'e', ' ', 'i', 's', ' ', 's', 'e', 'a']
#对整个列表进行列表段的首字母进行排序
>>> name_list.sort()
>>> name_list
[' ', ' ', ' ', ',', 'Adam', 'Angelia', 'Daisy', 'H', 'M', 'a', 'a', 'david', 'e', 'e', 'e', 'i', 'jack', 'l', 'l', 'm', 'n', 'o', 's', 's', 'sean', 'tom', 'y']
>>>
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Tuple


#定义元组name_tuple
>>> name_tuple = ('xiaoming','xiaohong','xiaoli','xiaozhang','xiaoming')
>>> name_tuple
('xiaoming', 'xiaohong', 'xiaoli', 'xiaozhang', 'xiaoming')
#统计xiaoming、xiaohong在元组内出现的次数
>>> name_tuple.count('xiaoming')
2
>>> name_tuple.count('xiaohong')
1
#查询xiaoming、xiaohong、xiaozhang在元组内的id号
>>> name_tuple.index('xiaoming')
0
>>> name_tuple.index('xiaohong')
1
>>> name_tuple.index('xiaozhang')
3
>>> 
#尝试增加一个元组单元
>>> name_tuple.append('xiaowang')
Traceback (most recent call last):
File "<pyshell#49>", line 1, in <module>
name_tuple.append('xiaowang')
AttributeError: 'tuple' object has no attribute 'append'
>>>
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The elements of the tuple are immutable. The elements of the group are variable


>>> tuple_A = (1,2,{'k1':'v1'})
>>> for i in tuple_A:
... print i
... 
1
2
{'k1': 'v1'}
#更改元素
>>> tuple_A[2]['k1'] = 'v2'
>>> for i in tuple_A:
... print i
... 
1
2
{'k1': 'v2'}
>>>
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