Access.py

from random import randint
class Register:

    def __init__(self):
        # dictionary keys
        # dict = {'username': {'user_id': xxx, 'username': xyz, 'password': xxxx, 'balance': zz, 'is_active': False/True}}
        self.store = {}
        self.id = 0
        self.name = ''
        self.balance = self.generateRandom(99, 999)
        self.is_active = False

    def generateRandom(self, start, stop):
        return randint(start, stop)

    def checkDB(self, name):
        if name in self.store.keys():
            return True
        return False

    def signup(self, name, password):

        self.id += 1
        self.name = name
        self.store[self.name] = {'user_id': self.id, 'username': name, 'password': password, 'balance': self.balance}
        print('\nAccount successfully created')
        print('Your details are:')
        print(f'\tUser ID: {self.id}')
        print(f'\tUsername: {name}')
        print(f'\tPasskey: {password}')
        print(f'\tBalance: {self.balance}')

    def authenticate(self, name, password):
        for k, v in self.store.items():
            if name == k:
                print('Authenticating')
                if password == v['password']:
                    print('Alert: Login Successful')
                    self.name = name
                    self.is_active = True
                    return True
                else:
                    print('Authentication error: Password is incorrect')
                    return False
        else:
            print('Details not in our DBase')
            return False


    def is_logged(self):
        if self.is_active:
            return True
        else:
            self.is_active = False
            return False

    def changePassword(self, old_password, new_password):
        if self.is_logged():
            if old_password == self.store[self.name]['password']:
                self.store[self.name]['password'] = new_password
                print('Password changed')
                return True
            else:
                print('Cant change password')
                return False
        else:
            print('You cant perform this operation because you aint logged in')
            return False

    def showSelf(self):
        if self.is_logged():
            for k, v in self.store.items():
                if self.name == k:
                    print('\tYour are user no: {}'.format(v['user_id']))
                    print('\tYour Username Is: {}'.format(v['username']))
                    print('\tYour Password Is: {}'.format(v['password']))
                    print('\tYour Current Balance: {}'.format(v['balance']))


    def displayAllUsers(self):
        if len(self.store.keys()) < 1:
            print('UserList is empty')
        else:
            for v in self.store.values():
                print('\tUser ID: {}'.format(v['user_id']))
                print('\tUsername: {}'.format(v['username']))
                print('\tPassword: {}'.format(v['password']))
                print('\tBalance: {}'.format(v['balance']))
                print()

    def deposit(self, amount):
        if self.is_logged():
            self.store[self.name]['balance'] += amount
            print('{} successfully deposited'.format(amount))
        else:
            print('An error occurred because you aint logged in')

    def withdraw(self, amount):
        if self.is_logged():
            if self.store[self.name]['balance'] < amount:
                print(f'The amount "{amount}" you are trying to withdraw is greater than your total account balance "{self.showBalance()}"')
            else:
                self.store[self.name]['balance'] -= amount
                print('Transaction successful')
                print(f'Your new balance is {self.showBalance()}')


    def showBalance(self):
        if self.is_logged():
            return self.store[self.name]['balance']

signup = Register()
while True:
    message = ['\nEnter "1" to Register', 'Enter "2" Login', 'Enter "3" to view all users', 'Enter "4" to Quit']
    print('\n'.join(message))

    userChoice = int(input('\nEnter your choice: '))
    if userChoice == 1:

        print('\nSignup Form')
        username = input('Enter your desired username: ')
        password = input('Enter secret key: ')
        check_username = signup.checkDB(username)
        if check_username:
            print('Name already exists in our DBase. Please choose another name and continue again')
        else:
            signup.signup(username, password)

    elif userChoice == 2:
        username = input('Enter your username: ')
        password = input('Enter your password: ')
        authenticate = signup.authenticate(username, password)
        if authenticate:
            while True:
                message_list = ['\nEnter "1" to change password', 'Enter "2" to view details', 'Enter "3" to deposit', 'Enter "4" to withdraw', 'Enter "5" to view balance', 'Enter "6" to go back main-menu\n']
                print('\n'.join(message_list))
                userChoice = int(input('\nMake your choice now: '))
                if userChoice == 1:
                    old_password = input('Enter your old password: ')
                    new_password = input('Enter your new password: ')
                    changePassword = signup.changePassword(old_password, new_password)
                elif userChoice == 2:
                    signup.showSelf()
                elif userChoice == 3:
                    deposit = int(input('Enter amount you will like to deposit: '))
                    signup.deposit(deposit)
                elif userChoice == 4:
                    withdraw = int(input('Enter amount you will like to withdraw: '))
                    signup.withdraw(withdraw)
                elif userChoice == 5:
                    print(signup.showBalance())
                elif userChoice == 6:
                    break
                else:
                    print('Unknown option')
    elif userChoice == 3:
        signup.displayAllUsers()
    elif userChoice == 4:
        exit()
    else:
        print('Unknown option')