Base para o exercício da Acens

auth.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-
from functools import wraps
from getpass import getpass
import sys

from db import Users


Logged = False

def authenticate(username, password):
    for user in Users:
        if user['username'] == username and user['password'] == password:
            return True
    return False


def login():
    global Logged
    if Logged:
        return
    username = raw_input("Digite o usuário: ")
    password = getpass("Digite a senha: ")
    if authenticate(username, password):
        Logged = True
        print "Usuário autenticado com sucesso!"
    else:
        print "Falha na autenticação do usuário!"
        sys.exit(0)


def login_required(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        login()
        return func(*args, **kwargs)
    return wrapper

db.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-

Users = [
    {
        'name': 'Fábio Cerqueira',
        'username': 'fabio',
        'password': 'acens',
    }
]

main.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-
import sys

from auth import login_required
from screens import menu
from db import Users


def show_users():
    print "show_users"


def exit():
    print 'Bye bye!'
    sys.exit(0)


@login_required
def admin():
    print "Admin!"


def home():
    menu_text = """
    Menu:
        1 - Mostrar usuários
        2 - Admin
        9 - Exit
    """
    options = {
        '1': show_users,
        '2': admin,
        '9': exit
    }
    menu(menu_text, options)


if __name__ == '__main__':
    home()

screens.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-

def menu(menu_text, options):
    while True:
        print menu_text
        option = raw_input("Escolha uma opção: ")
        screen = options.get(option)
        if screen:
            screen()
        else:
            print "Opção inválida!"