method_call_methods.py

#!/usr/bin/env python
# -*- coding: UTF8 -*-
#-------------------------------------------------------------------------------
# Author    :  Oluwaseun Peter
# Copyright : Copyright (C) 2018
# Target    : All platforms supporting python
# Limitations : None known as of now
#-------------------------------------------------------------------------------

class Library:
    def __init__(self, books=[]):
        self._id = 0
        self._catalog = books
        self._book_name = ''


    def display_avail_book(self):
        pass

    def borrow_out_book(self, title):
        pass

    def add_borrowed_book(self, title):
        pass

class User:
    def __init__(self):
        self._name = ''
        self.database = {}
        self._id = 0

    def _increment_id(self):
        self._id += 1
        return self._id

    def _find_error(self, username, password):
        if not username.isspace() or username == '':
            if username in self.database.keys():
                print('The username: "{}" you chose is already registered with us. Please choose another one'.format(username))
                return True
            elif len(username) <= 3 or len(username) >= 15:
                print('The username you entered should be between 3 and 15 characters')
                return True
            elif username.isspace():
                print('Username field cannot be empty')
                return True
            elif password.isspace():
                print('Password cant be left blank')
                return True
        else:
            return False

    def _set_user_details(self, username):
        self.username = username.lower()
        #self.password = password

    def _signup(self, username, password):
        increment_user_id = self._increment_id()
        self.database[self.username] = {'user_id': increment_user_id, 'username': username, 'password': password}
        print('Success')

    def display_signup_form(self):
        username = input('Enter your username: ')
        password = input('Enter your password: ')
        find_error = self._find_error(username, password)
        if not find_error:
            self._set_user_details(username)
            self._signup(username, password)



    def show(self):
        print(self.database)


class Menu:
    def display_menu(self):
        userMenu = ['Enter 1 to signup', 'Enter 2 login']
        print('\n'.join(userMenu))
        try:
            userChoice = int(input('Make your choice: '))
            if isinstance(userChoice, int):
                self.userChoice = userChoice
        except ValueError:
            print('Wrong input')
        else:
            return self.userChoice

library = Library()
access = User()
usermenu = Menu()

print('Welcome to my Second Project')
print()
print('-------------------------------')
print('Title: Library System')
print('Version:  1')
print('-------------------------------')

print()

while True:
    userChoice = usermenu.display_menu()
    if userChoice == 1:
        signup_form = access.display_signup_form()
    if userChoice == 2:
        access.show()