Python学习第三天-Python中的数据结构

所向无敌

　　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()