Pythonは電話帳を編纂して添削検査機能を実現する

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.

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]()

以上が本文のすべてで、Pythonプログラムの設計を学ぶのに役立つことを望んでいます.