用python实现简易学生管理系统

 1 #!/usr/bin/python3
 2 #coding=utf-8 
 3 #__author__=‘jeavenwong‘
 4 
 5 
 6     
 7  
 8 #实现switch-case语句用 
 9 class switch(object):
10     def __init__(self, value):
11         self.value = value
12         self.fall = False
13 
14     def __iter__(self):
15         """Return the match method once, then stop"""
16         yield self.match
17         raise StopIteration
18 
19     def match(self, *args):
20         """Indicate whether or not to enter a case suite"""
21         if self.fall or not args:
22             return True
23         elif self.value in args: # changed for v1.5, see below
24             self.fall = True
25             return True
26         else:
27             return False
28  
29 class student:
30     def __init__(self,name,age,id,grade):
31         self.next = None
32         self.name = name
33         self.age = age
34         self.id = id
35         self.grade = grade
36     def show(self):
37         print(‘name:‘,self.name,‘ ‘,‘age:‘,self.age,‘ ‘,‘id:‘,self.id,‘ ‘,‘grade:‘,self.grade)
38         
39 class stulist: 
40     def __init__(self):
41         self.head = student(‘‘,0,0,0)
42     def display(self):
43         p = self.head.next
44         while p:
45             p.show()
46             p = p.next
47     def insert(self):
48         print(‘please enter:‘)
49         name = input(‘name:‘)
50         age = input(‘age:‘)
51         id = input(‘id:‘)
52         grade = input(‘grade:‘)
53         newstu = student(name,age,id,grade)
54         p = self.head
55         while p.next:
56             p = p.next
57         p.next = newstu
58     def query(self):
59         name = input(‘please enter the name you want to query:‘)
60         p = self.head.next
61         while p:
62             if p.name == name:
63                 p.show()
64             p = p.next
65 
66 
67 def main():
68     stulist1 = stulist()
69     user_input = input(‘please enter the OPcode:‘)
70     while user_input:
71         print(‘a--insert/b--display/c--query/o--text/‘‘--defult‘)
72         for case in switch(user_input):
73             if case(‘a‘): 
74                 stulist1.insert()
75                 user_input = input(‘please enter the OPcode:‘)
76                 break
77             if case(‘b‘):
78                 stulist1.display()
79                 user_input = input(‘please enter the OPcode:‘)
80                 break
81             if case(‘c‘): 
82                 stulist1.query()
83                 user_input = input(‘please enter the OPcode:‘)
84                 break
85             if case(): # default
86                 print(‘please enter the OPcode...‘)
87                 user_input = input(‘please enter the OPcode:‘)
88                 break
89         
90 if __name__ == "__main__":
91     main()