Home > Article > Backend Development > How to use and differentiate between lists and tuples in Python
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.
#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'] >>>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' >>>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'} >>>For more related articles on the usage and differences of lists and tuples in Python, please pay attention to PHP Chinese net!