Menu Python CA

import csv

def menu():
    choice = input("Welcome to the Quiz Menu, \n 1. Login \n 2. Register \n 3. Quit \n")
    if choice == '1':
        login()
    elif choice == '2':
        register()
    else:
        quit()


def login():
    with open('users.csv') as csvfile:
            reader = csv.DictReader(csvfile)
            database = []
            for row in reader:
                database.append(dict(username=row['username'],
                                     password=row['password'],
                                     admin=row['admin']))
    loggedin = False
    while not loggedin:
        Username = input('Fill in your username: ')
        Password = input('Fill in your password: ')
        for row in database:
            Username_File = row['username']
            Password_File = row['password']
            Admin_File = row['admin']
            if (Username_File == Username and
                Password_File == Password and
                 Admin_File == '0'):
                loggedin = True
                print('Succesfully logged in as a Student.')
            elif (Username_File == Username and
                  Password_File == Password and
                    Admin_File == '1'):
                loggedin = True
                print('Succesfully logged in as an Admin.')
        if loggedin is not True:
            print ('Failed to sign in, wrong username or password.')


def register():
    with open('users.csv') as csvfile:
        reader = csv.DictReader(csvfile)
        database = []
        for row in reader:
            database.append(dict(Name_File = row['first_name'],
                                LName_File = row['last_name'],
                                Password_File = row['password'],
                                Age_File = row['age'],
                                YearGroup_File = row['year_group']))
    register = False
    while register is not True:
        Name = input('Fill in your name: ')
        database.append(dict(Name_File = row['first_name']))
        LName = input('Fill in your last name: ')
        database.append(dict(LName_File = row['last_name']))
        Age = input('Fill in your age: ')
        database.append(dict(Age = row['age']))
        YearGroup = input('Fill in your year group ')
        database.append(dict(YearGroup = row['year_group']))
        Password = input('Fill in your password ')
        database.append(dict(Password = row['password']))
        Username = (Name[:3]+Age)
        print("Your username is :", Username)
        database.append(dict(Username = row['username']))
        register = True
        print("You've Succesfully Registered")