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

This article describes in detail how to add, delete, modify, and query a phone book in Python, if you are interested, please refer to this article for details about how to add, delete, modify, and query functions in Python. if you are interested, please refer

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.

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