SMS manager.py

import re
class Contact:
    def __init__(self,name,phone,email):
        self.name = name
        self.phone = phone
        self.email = email
        self.message = ""

class Message:
    def __init__(self,name):
        self.name=name
        self.baza=[]

    def add_contact(self):
        name=(input("enter your name:"))
        while True:
            phone = input("enter your phone:")
            s = r'^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$'
            if re.match(s, phone):
                break
            else:
                print("raqamni noto'g'ri kiritingiz")
        while True:
            email = input("enter your email:")
            a=r'[^@ \t\r\n]+@[^@ \t\r\n]+\.[^@ \t\r\n]+'
            if re.match(a, email):
                break
            else:
                print("emailni noto'g'ri kiritingiz")
        p=Contact(name,phone,email)
        self.baza.append(p)

    def view_contact(self):
        count=0
        for item in self.baza:
            count+=1
            print(f'{count}. name:{item.name} phone:{item.phone} email:{item.email}')

    def update_contact(self):
        try:
            self.view_contact()
            index = int(input("Which one:"))
            contact = self.baza[index - 1]
            print("1.name\n2.phone\n3.email")
            choice = input("Choice one:")

            if choice == "1":
                new_name = input("New name: ")
                contact.name = new_name

            elif choice == "2":
                new_phone = input("New phone: ")
                m = r'^[\+]?[(]?[0-9]{3}[)]?[-\s\.]?[0-9]{3}[-\s\.]?[0-9]{4,6}$'
                if re.match(m, new_phone):
                    contact.phone = new_phone

            elif choice == "3":
                new_email = input("New email: ")
                n = r'[^@ \t\r\n]+@[^@ \t\r\n]+\.[^@ \t\r\n]+'
                if re.match(n, new_email):
                    contact.email = new_email
        except ValueError:
            print("Contact bo'sh")

    def delete_contact(self):
        self.view_contact()
        index = int(input("Which one: "))
        contact = self.baza[index - 1]
        if index == 1:
         del self.baza[index - 1]
         print("<<<Deleted>>>")
a=Message("Contact")

def manager_contact(s:Message):
    while True:
        print("1.View contact\n2.Add contact\n3.Update\n4.delete contact\n5.Exit")
        code=input("Enter code:")
        if code=="1":
            a.view_contact()
        elif code=="2":
            a.add_contact()
        elif code=="3":
            a.update_contact()
        elif code=="4":
            a.delete_contact()
        else:
            break
manager_contact(a)