Python练手程序——通讯录

 

需要注意的几点：

1.list的初始化

2.cPickle的load和dump方法的使用

3.class的存储

4.sort函数的使用

5.global标签的使用

6.初始的时候不存在memberlist.data或者文件内容为空解决方法

2016.01.12

7.begin函数：初始的时候文件中有内容，调用read判断是否有内容后，需要调用seek移动指针到文件起始位置

8.delete函数：pop元素之后需要return或break，否则会出现指针越界错误

  1 #Filename:MyAddressBook.py
  2 import cPickle as p
  3 import os
  4 #Class Item
  5 class Item:
  6     def __init__(self,name,age,gender):
  7         self.name = name
  8         self.age = age
  9         self.gender = gender
 10 #the main menu of address book   
 11 def menu():
 12     '''the main menu of address book'''
 13     print ''
 14     print '1.Insert an item'
 15     print '2.Delete an item'
 16     print '3.Modify an item'
 17     print '4.Display all items'
 18     print '5.Sort all items'
 19     print '6.Exit the program'
 20     print 'What do you want to do?'
 21     
 22 #initialization of system, load the member list
 23 def begin():
 24     '''initialization of system, load the member list'''
 25     global itemlist
 26     if os.path.exists('memberlist.data') == True:#to judge whether the file exists
 27         listfile = file('memberlist.data','r')
 28         if len(listfile.read())!=0:#to judge whether the file is empty
 29             listfile.seek(0);
 30             itemlist = p.load(listfile)        
 31         listfile.close()
 32 #exitance of system, store the menber list
 33 def end():
 34     '''exitance of system, store the menber list'''
 35     global itemlist
 36     listfile = file('memberlist.data','w+')
 37     p.dump(itemlist,listfile)
 38     listfile.close()
 39 #insert an item into the member list   
 40 def insert():
 41     '''insert an item into the member list'''
 42     name = raw_input('Enter name:')
 43     age = int(raw_input('Enter age:'))
 44     gender = raw_input('Enter gender:')
 45     item = Item(name,age,gender)
 46     global itemlist
 47     itemlist.append(item)
 48 #print an item
 49 def output(item):
 50     '''print an item'''
 51     print '%-15s%-5d%s'%(item.name,item.age,item.gender)
 52 #print all items       
 53 def display():
 54     '''print all items'''
 55     global itemlist
 56     l = len(itemlist)
 57     print 'name           age  gender'
 58     for i in range(0,l):
 59         output(itemlist[i])
 60     print ''
 61 #delete an item by name from member list
 62 def delete():
 63     '''delete an item by name from member list'''
 64     name = raw_input('Enter the name you want to delete:')
 65     global itemlist
 66     l = len(itemlist)
 67     for i in range(0,l):
 68         if (itemlist[i].name == name):
 69             itemlist.pop(i)
 70             break
 71 #update an item
 72 def update(item):
 73     '''update an item'''
 74     item.name = raw_input('Enter name:')
 75     item.age = int(raw_input('Enter age:'))
 76     item.gender = raw_input('Enter gender:')
 77 #update an item's information by name 
 78 def modify():
 79     '''update an item's information by name'''
 80     name = raw_input('Enter the name you want to modify:')
 81     global itemlist
 82     l = len(itemlist)
 83     for i in range(0,l):
 84         if (itemlist[i].name == name):
 85             update(itemlist[i])
 86     print 'Update done!'
 87 #sort all items by name
 88 def sort():
 89     global itemlist
 90     itemlist.sort(None,key = lambda item:item.name)
 91     print 'Sort done!'
 92 #Here are the scripts
 93 itemlist = [] #Notice here!!!
 94 begin()
 95 while True:
 96     menu()
 97     sel = int(raw_input())
 98     if sel == 1:
 99         insert()
100     elif sel == 2:
101         delete()
102     elif sel == 3:
103         modify()
104     elif sel == 4:
105         display()
106     elif sel == 5:
107         sort()
108     else:
109         break
110 end()
111 print 'Good Bye!'

 

 

posted @ 2012-11-05 11:27  ZH奶酪  阅读(6787)  评论(8)  编辑  收藏  举报