Python学习(五):基本的数据结构——元组及常用方法

1.元组的概述:

元组与列表类似,由任意类型的元素组成序列;

元组是不可变的(与列表不同处);

2.元组的创建及检验:

>>> tuple_1 = (1,2,3,4)
>>> tuple_1
(1, 2, 3, 4)
>>> tuple_2 = 1,2,3
>>> tuple_2
(1, 2, 3)
>>> tuple_3 = (1)
>>> type(tuple_3)
<class 'int'>
>>> tuple_3 = (1,) #注意,创建单个值的元组时候,必须后面加,
>>> type(tuple_3)
<class 'tuple'>
>>> tuple_3 = 1,
>>> type(tuple_3)
<class 'tuple'>
>>> tuple_3
(1,)
>>> tuple_4=() #创建空元组直接括号即可。
>>> type(tuple_3)
<class 'tuple'>

 

2.元组的切片等方法:

>>> tuple_2 = 22, 44, 66
>>> tuple_2
(22, 44, 66)
>>> tuple_2[2]
66

#注意,元组是不可变,如下更改元组元素,会报错
>>> tuple_2[2]=88
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment


#重新赋值的方法,取变量赋值
>>> a, b, c=tuple_2
>>> a
22
>>> a, b = b, a
>>> a
44

#数组转为元组
>>> lis = ['q','w','e']
>>> tuple(lis)
('q', 'w', 'e')

#字典转为元组,注意,转换中会将key转为元组元素
>>> dic={'a':1,'b':2}
>>> tuple(dic)
('a', 'b')

 

posted @ 2022-12-01 19:08  coderjim  阅读(101)  评论(0编辑  收藏  举报

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