tuple即元组
简介和基本的属性
1 # -*- coding: utf-8 -*- 2 """ 3 Created on Tue Jun 03 20:39:19 2014 4 5 @author: Administrator 6 """ 7 8 """ 9 ' tuple是一种集合类型(collection type),可构建简单对象的组别 10 ' 功能同list，但是tuple不可以修改，用()而不是[]构建，不支持方法调用 11 ' 但是其大多数属性同list 12 ' tuple是任意对象的有序集合 13 ' tuple通过偏移量进行访问 14 ' tuple是分类不可变的序列(of the category immutable sequence) 15 ' tuple是固定长度、异质性、可随意嵌套 16 ' tuple是对象引用的数组 17 """ 18 19 # an empty tuple demo 20 # 用括号可提高代码的可读性 21 tpl_1 = () 22 print tpl_1 23 24 # A one-item tuple 25 tpl_2 = (0,) 26 27 print tpl_2 28 print type(tpl_2) 29 30 # an integer 31 x = (40) 32 33 print x 34 print type(x) 35 36 # a four-item tuple 37 tpl_3 = (0,'Ni',2,3) 38 print tpl_3 39 40 # another four-item tuple 41 tpl_4 = 0,'Ni',2,3 42 print tpl_4 43 44 # nested tuples 45 tpl_5 = ('abc',('def','ghi')) 46 print tpl_5 47 48 # index, index of index, slice and length 49 print tpl_3[2] 50 51 print tpl_4[1][1] 52 53 print tpl_3[1:3] 54 55 print len(tpl_5) 56 57 # concatenate 58 print tpl_2 + tpl_3 59 60 print (1,2) + (3,4) 61 62 # repeat 63 print tpl_3 * 3 64 65 print (1,2) * 3 66 67 # iteration, membership 68 for item in tpl_4: 69 print item * 2 70 71 if('spam' in tpl_4): 72 print 'spam is in tpl_4' 73 else: 74 print 'spam is not in tpl_4'