【python】——ウィジェットの電話帳

pythonを初めて勉強して、小さなプログラムを書いて練習します.主な機能は、削除・変更のいくつかの機能です.主に使用される技術:辞書の使用、pickleの使用、ioファイルの操作.コードは次のとおりです.

 1 import pickle
 2 
 3 #studentinfo = {'netboy': '15011038018',\
 4 #                               'godboy': '15011235698'}
 5 studentinfo = {}
 6 
 7 FUNC_NUM = 5
 8 
 9 def write_file(value):
10         file = open('student_info.txt', 'wb')
11         file.truncate()
12         pickle.dump(value, file, True)
13         file.close
14 
15 def read_file():
16         global studentinfo
17         file = open('student_info.txt', 'rb')
18         studentinfo = pickle.load(file)
19         file.close()
20 
21 def search_student():
22         global studentinfo
23         name = input('please input student\'s name:')
24         if name in studentinfo:
25                 print('name:%s phone:%s' % (name, studentinfo[name]))
26         else:
27                 print('has no this body')
28 
29 def delete_student():
30         global studentinfo
31         name = input('please input student\'s name:')
32         if name in studentinfo:
33                 studentinfo.pop(name)
34                 write_file(studentinfo)
35         else:
36                 print('has no this body')
37 
38 def add_student():
39         global studentinfo
40         name = input('please input student\'s name:')
41         phone = input('please input phone:')
42         studentinfo[name] = phone
43         write_file(studentinfo)
44 
45 def modifiy_student():
46         global studentinfo
47         name = input('please input student\'s name:')
48         if name in studentinfo:
49                 phone = input('please input student\'s phone:')
50                 studentinfo[name] = phone
51         else:
52                 print('has no this name')
53 
54 def show_all():
55         global studentinfo
56         for key, value in studentinfo.items():
57                 print('name:' + key + 'phone:' + value)
58 
59 func = {1 : search_student, \
60         2 : delete_student, \
61         3 : add_student, \
62         4 : modifiy_student, \
63         5 : show_all}
64 
65 def menu():
66         print('-----------------------------------------------');
67         print('1 search student:')
68         print('2 delete student:')
69         print('3 add student:')
70         print('4 modifiy student:')
71         print('5 show all student')
72         print('6 exit')
73         print('-----------------------------------------------');
74 
75 def init_data():
76         global studentinfo
77         file = open('student_info.txt', 'rb')
78         studentinfo = pickle.load(file)
79         #print(studentinfo)
80         file.close()
81 
82 init_data()
83 while True:
84         menu()
85         index = int(input())
86         if index == FUNC_NUM + 1:
87                 exit()
88         elif index < 1 or index > FUNC_NUM + 1:
89                 print('num is between 1-%d' %  (FUNC_NUM + 1))
90                 continue
91         #print(index)
92         func[index]()

間違いがあったり、もっと良い考えがあったりしたら、教えてください.