Python中的元组

>>> info = (‘林间‘,‘Man‘,1991,7,13,True)    #支持不同类型

>>> info = (‘林间‘,‘Man‘,(1991,7,13),True)    #支持嵌套

>>> info[0]    #支持常见的序列操作
‘林间‘

>>> info[:2]    #切片
(‘林间‘, ‘Man‘)

>>> info[1] = ‘Women‘　　#不可改变，对元组进行排序或重新赋值都是不行的
Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    info[1] = ‘Women‘
TypeError: ‘tuple‘ object does not support item assignment

>>> tuple1 = (1)    #单单只有圆括号不能创建一个元组
>>> type(tuple1)
<class ‘int‘>

>>> tuple2 = 1,2,3    #加上逗号就能成功创建元组，圆括号不是必须的
>>> type(tuple2)
<class ‘tuple‘>

>>> tuple3 = 1,    #创建单个元素的元组
>>> type(tuple3)
<class ‘tuple‘>

>>> tuple4 = ()    #创建空元组
>>> type(tuple4)
<class ‘tuple‘>

>>> info = (‘林间‘,‘Man‘,(1991,7,13),True)
>>> info = info[:2] + (173,) + info[2:]　　#实际上第一行中的元组并没有消失，只是没有变量名指向它了
>>> info
(‘林间‘, ‘Man‘, 173, (1991, 7, 13), True)

>>> info
(‘林间‘, ‘Man‘, 173, (1991, 7, 13), True)
>>> del info
>>> info
Traceback (most recent call last):
  File "<pyshell#36>", line 1, in <module>
    info
NameError: name ‘info‘ is not defined