Python学习第三天-Python中的数据结构
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
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 = "aaaaa"
array2 = ("array2",array1)
print "array2:"
print array2
print "array in another array:"
print array2
print array2
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 = "aaaaa"
array2 = ("array2",array1)
print "array2:"
print array2
print "array in another array:"
print array2
print array2
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
print "Index is 1 , value is%s" %mylist
print "Index is 2 , value is%s" %mylist
print "Index is 3 , value is%s" %mylist
print "Index is 4 , value is%s" %mylist
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
print "Index is 4---?, value is %s" %mylist
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
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
print "Index is 4---?, value is %s" %strtest
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
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()
页:
[1]