零基础入门学习Python学习笔记第六讲【元组】

列表可以随便改变元素，元组不能随便改变元素，

>>> tuple1 = (1,2,3,4,5)          #创建元组
>>> tuple1
(1, 2, 3, 4, 5)
>>> tuple1[1]                     #索引元组
2
>>> tuple1[2:]             
(3, 4, 5)
>>> tuple1[:]
(1, 2, 3, 4, 5)

>>> list1 = [1,23,4,5,6]
>>> list1[2] = 6                  #列表可以随便改变元素
>>> list1
[1, 23, 6, 5, 6]
>>> tuple1[1] = 2                 #元组不能随便改变元素
Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    tuple1[1] = 2
TypeError: 'tuple' object does not support item assignment

>>> temp = (1)
>>> temp
1
>>> type(temp)
<class 'int'>
>>> temp = (1,)                #逗号是关键，不加逗号就是int类型
>>> temp
(1,)
>>> type(temp)
<class 'tuple'>
>>> temp = ()                 
>>> temp
()
>>> temp = 1,
>>> type(temp)
<class 'tuple'>

>>> 8 * (8)
64
>>> 8 * (8,)
(8, 8, 8, 8, 8, 8, 8, 8)


>>> temp = ("小甲鱼","小鲤鱼","中华鲟")          #利用分片在
>>> temp = temp[:1]+("小金鱼",)+temp[1:]         #注意小金鱼后面的逗号
>>> temp
('小甲鱼', '小金鱼', '小鲤鱼', '中华鲟')

>>> del temp               #删除元组
>>> temp
Traceback (most recent call last):
  File "<pyshell#32>", line 1, in <module>
    temp
NameError: name 'temp' is not defined