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作者 | 正文 |
发表时间:2009-11-20
最后修改:2009-11-20
Python有列表 元组(数组) 字典(map表结构) 序列
列表、元组和字符串都是序列,但是序列是什么,它们为什么如此特别呢?序列的两个主要特点是索引 操作符和切片 操作符。索引操作符让我们可以从序列中抓取一个特定项目。切片操作符让我们能够获取序列的一个切片,即一部分序列。
请看列表 代码: ''' Created on 2009-11-20 @author: Administrator ''' if __name__ == '__main__': print "aaa" def mylist(): list1 = ["index1","index2",3] print "list length :%d " % len(list1) print "all list element : %s" % list1 print "for list : " i = 0; for a in list1: print "Index is %d,and value is %s" % (i,a) i=i+1 print "index is -1,value is %s" % list1[-1] print "index is -2,value is %s" % list1[-2] #append method print "append a element : 46" list1.append(46); print "list length :%d " % len(list1) #delete index 0 element print "Delete index 0 element" del list1[0] print "list length :%d " % len(list1)
数组 代码: ''' Created on 2009-11-20 @author: Administrator ''' if __name__ == '__main__': pass def myarray(): array1 = ("array_index1","arrray_index2",333,100000) print "array length is %d" % len(array1) i = 0 for a in array1: print "Index is %d and value is %s" % (i,a) i = i+1 print "Index is -1 and value is %s" % array1[-1] #error !!! #array1[5] = "aaaaa" array2 = ("array2",array1) print "array2:" print array2 print "array in another array:" print array2[1] print array2[1][0]
字典 代码:
''' Created on 2009-11-20 @author: Administrator ''' if __name__ == '__main__': pass def myarray(): array1 = ("array_index1","arrray_index2",333,100000) print "array length is %d" % len(array1) i = 0 for a in array1: print "Index is %d and value is %s" % (i,a) i = i+1 print "Index is -1 and value is %s" % array1[-1] #error !!! #array1[5] = "aaaaa" array2 = ("array2",array1) print "array2:" print array2 print "array in another array:" print array2[1] print array2[1][0]
序列 代码: ''' Created on 2009-11-20 @author: Administrator ''' if __name__ == '__main__': pass def myseq(): mylist = ["element1", "element2", "element2", "element3", "element5"] print "Index is 0 , value is %s" % mylist[0] print "Index is 1 , value is %s" %mylist[1] print "Index is 2 , value is %s" %mylist[2] print "Index is 3 , value is %s" %mylist[3] print "Index is 4 , value is %s" %mylist[4] print "Index is -1 , value is %s" % mylist[-1] print "Index is -2 , value is %s" % mylist[-2] print "Index is -3 , value is %s" % mylist[-3] print "Index is -4 , value is %s" % mylist[-4] print "Index is -5 , value is %s" % mylist[-5] #error #print "Index is -6 , value is %s" % mylist[-6] print "Index is 1---4, value is %s" %mylist[1:4] print "Index is 4---?, value is %s" %mylist[4:] print "Index is -7---?, value is %s" %mylist[-7:] print "Index is -6---?, value is %s" %mylist[-6:] print "Index is -4---?, value is %s" %mylist[-4:] print "Index is -5---?, value is %s" %mylist[-5:] print "Index is -55---?, value is %s" %mylist[-55:] print "Index is 55---?, value is %s" %mylist[55:] print "Index is ?---55, value is %s" %mylist[:55] print "Index is ?--- -4, value is %s" %mylist[:-4] strtest = "I love python" print "=====================Test string seq start.....===================" print "Index is 1---4, value is %s" %strtest[1:4] print "Index is 4---?, value is %s" %strtest[4:] print "Index is -7---?, value is %s" %strtest[-7:] print "Index is -6---?, value is %s" %strtest[-6:] print "Index is -4---?, value is %s" %strtest[-4:] print "Index is -5---?, value is %s" %strtest[-5:] print "Index is -55---?, value is %s" %strtest[-55:] print "Index is 55---?, value is %s" %strtest[55:] print "Index is ?---55, value is %s" %strtest[:55] print "Index is ?--- -4, value is %s" %strtest[:-4]
测试文件代码:
print "=========================================List test=========================" import mylist #mylist.mylist(); print "=========================================Array test=========================" import myarray #myarray.myarray() print "=========================================Map test=========================" import mymap #mymap.mymap() print "=========================================Seq test=========================" import myseq myseq.myseq()
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