Automated Teller Machine System using Python

import getpass import string import os users = ['john1'] pins = ['1234'] amounts = [10000] count = 0 while True: user = input('\nENTER USER NAME: ') user = user.lower() if user in users: if user == users[0]: n = 0 else: n = 2 break else: print('----------------') print('****************') print('INVALID USERNAME') print('****************') print('----------------') # comparing pin while count < 3: print('------------------') print('******************') pin = str(getpass.getpass('PLEASE ENTER PIN: ')) print('******************') print('------------------') if pin.isdigit(): if user == users[0]: if pin == pins[0]: break else: count += 1 print('-----------') print('***********') print('INVALID PIN') print('***********') print('-----------') print() else: print('------------------------') print('************************') print('PIN CONSISTS OF 4 DIGITS') print('************************') print('------------------------') count += 1 # in case of a valid pin- continuing, or exiting if count == 3: print('-----------------------------------') print('***********************************') print('3 UNSUCCESFUL PIN ATTEMPTS, EXITING') print('!!!!!YOUR CARD HAS BEEN LOCKED!!!!!') print('***********************************') print('-----------------------------------') exit() print('-------------------------') print('*************************') print('LOGIN SUCCESFUL, CONTINUE') print('*************************') print('-------------------------') print() print('--------------------------') print('**************************') print(str.capitalize(users[n]), 'User Account') print('**************************') print('Automated Teller Machine System') while True: print('-------------------------------') print('*******************************') response = input('SELECT FROM FOLLOWING OPTIONS: \nStatement__(S) \nWithdraw___(W) \nDeposit__(L) \nChange PIN_(P) \nQuit_______(Q) \n: ').lower() print('*******************************') print('-------------------------------') valid_responses = ['s', 'w', 'l', 'p', 'q'] response = response.lower() if response == 's': print('---------------------------------------------') print('*********************************************') print(str.capitalize(users[n]), 'YOU HAVE $',amounts[n],' ON YOUR ACCOUNT.') print('*********************************************') print('---------------------------------------------') elif response == 'w': print('---------------------------------------------') print('*********************************************') cash_out = int(input('ENTER AMOUNT YOU WOULD LIKE TO WITHDRAW: ')) print('*********************************************') print('---------------------------------------------') if cash_out%10 != 0: print('------------------------------------------------------') print('******************************************************') print('AMOUNT YOU WANT TO WITHDRAW MUST TO MATCH 10 EURO NOTES') print('******************************************************') print('------------------------------------------------------') elif cash_out > amounts[n]: print('-----------------------------') print('*****************************') print('YOU HAVE INSUFFICIENT BALANCE') print('*****************************') print('-----------------------------') else: amounts[n] = amounts[n] - cash_out print('-----------------------------------') print('***********************************') print('YOUR NEW BALANCE IS: ', amounts[n], 'EURO') print('***********************************') print('-----------------------------------') elif response == 'l': print() print('---------------------------------------------') print('*********************************************') cash_in = int(input('ENTER AMOUNT YOU WANT TO LODGE: ')) print('*********************************************') print('---------------------------------------------') print() if cash_in%10 != 0: print('----------------------------------------------------') print('****************************************************') print('AMOUNT YOU WANT TO LODGE MUST TO MATCH 10 EURO NOTES') print('****************************************************') print('----------------------------------------------------') else: amounts[n] = amounts[n] + cash_in print('----------------------------------------') print('****************************************') print('YOUR NEW BALANCE IS: ', amounts[n], 'EURO') print('****************************************') print('----------------------------------------') elif response == 'p': print('-----------------------------') print('*****************************') new_pin = str(getpass.getpass('ENTER A NEW PIN: ')) print('*****************************') print('-----------------------------') if new_pin.isdigit() and new_pin != pins[n] and len(new_pin) == 4: print('------------------') print('******************') new_ppin = str(getpass.getpass('CONFIRM NEW PIN: ')) print('*******************') print('-------------------') if new_ppin != new_pin: print('------------') print('************') print('PIN MISMATCH') print('************') print('------------') else: pins[n] = new_pin print('NEW PIN SAVED') else: print('-------------------------------------') print('*************************************') print(' NEW PIN MUST CONSIST OF 4 DIGITS \nAND MUST BE DIFFERENT TO PREVIOUS PIN') print('*************************************') print('-------------------------------------') elif response == 'q': exit() else: print('------------------') print('******************') print('RESPONSE NOT VALID') print('******************') print('------------------')