Python编写电话薄实现增删改查

初学python，写一个小程序练习一下。主要功能就是增删改查的一些功能。主要用到的技术：字典的使用，pickle的使用，io文件操作。代码如下：

import pickle

#studentinfo = {'netboy': '15011038018',
# 'godboy': '15011235698'}
studentinfo = {}

FUNC_NUM = 5

def write_file(value):
 file = open('student_info.txt', 'wb')
 file.truncate()
 pickle.dump(value, file, True)
 file.close

def read_file():
 global studentinfo
 file = open('student_info.txt', 'rb')
 studentinfo = pickle.load(file)
 file.close()

def search_student():
 global studentinfo
 name = input('please input student's name:')
 if name in studentinfo:
 print('name:%s phone:%s' % (name, studentinfo[name]))
 else:
 print('has no this body')

def delete_student():
 global studentinfo
 name = input('please input student's name:')
 if name in studentinfo:
 studentinfo.pop(name)
 write_file(studentinfo)
 else:
 print('has no this body')

def add_student():
 global studentinfo
 name = input('please input student's name:')
 phone = input('please input phone:')
 studentinfo[name] = phone
 write_file(studentinfo)

def modifiy_student():
 global studentinfo
 name = input('please input student's name:')
 if name in studentinfo:
 phone = input('please input student's phone:')
 studentinfo[name] = phone
 else:
 print('has no this name')

def show_all():
 global studentinfo
 for key, value in studentinfo.items():
 print('name:' + key + 'phone:' + value)

func = {1 : search_student, 
 2 : delete_student, 
 3 : add_student, 
 4 : modifiy_student, 
 5 : show_all}

def menu():
 print('-----------------------------------------------');
 print('1 search student:')
 print('2 delete student:')
 print('3 add student:')
 print('4 modifiy student:')
 print('5 show all student')
 print('6 exit')
 print('-----------------------------------------------');

def init_data():
 global studentinfo
 file = open('student_info.txt', 'rb')
 studentinfo = pickle.load(file)
 #print(studentinfo)
 file.close()

init_data()
while True:
 menu()
 index = int(input())
 if index == FUNC_NUM + 1:
 exit()
 elif index < 1 or index > FUNC_NUM + 1:
 print('num is between 1-%d' % (FUNC_NUM + 1))
 continue
 #print(index)
 func[index]()