Write a phone book in Python to add, delete, modify, and query functions.

Write a phone book in Python to add, delete, modify, and query functions.

For python beginners, write a small program to practice. The main function is to add, delete, modify, and query functions. The main technologies used: dictionary usage, pickle usage, and io file operations. The Code is as follows:

import pickle#studentinfo = {'netboy': '15011038018',\#                'godboy': '15011235698'}studentinfo = {}FUNC_NUM = 5def write_file(value):    file = open('student_info.txt', 'wb')    file.truncate()    pickle.dump(value, file, True)    file.closedef 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]()

The above is all the content of this article. I hope it will help you learn Python programming.