元组
个人认为就像java的数组,python中的元组有以下特性:
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任意对象的有序集合,这条没啥说的,数组的同性;
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通过偏移读取;
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一旦生成,不可改变;
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固定长度,支持嵌套
默认Python元组
1)所有的多对象的,逗号分隔的,没有明确用符号定义。
>>> 1,2,3,'a'
(1, 2, 3, 'a')
2)所有函数返回的多对象
>>> def f():
return 1,2,3
>>> f()
(1, 2, 3)
单对象Python元组
>>> a=('a')
>>> type(a)
< type 'str'>
>>>
非要创建单对象元组,可以通过下面这种做法:
>>> a=('a',)
>>> type(a)
< type 'tuple'>
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#coding:utf-8
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#!/usr/bin/python
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# Filename: tuple.py
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mytuple=(1,2,5,6,"abc")
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for i in mytuple:
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print i
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str=mytuple[-1]
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print str
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a=1
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b=2
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a,b=b,a
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print "交换之前a=1,b=2 之后a=%d b=%d" %(a,b)
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addressbook=(("king","qq:123444","tel:4566"),("jack","qq:123555","tel:456677"),("tom","qq:123666","tel:2224566"),
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("peter","qq:123777","tel:45668888"))
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#遍历二维数组
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for i in xrange(len(addressbook)):
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for j in xrange(len(addressbook[i])):
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print addressbook[i][j],
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print "n",
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1
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2
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5
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6
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abc
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abc
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交换之前a=1,b=2 之后a=2 b=1
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king qq:123444 tel:4566
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jack qq:123555 tel:456677
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tom qq:123666 tel:2224566
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peter qq:123777 tel:45668888
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