Atm

import getpass
import string
import os

users=['sugi','sabaree','malarkodi','arjun']
pins=['1234','5678','8906','1580']
amounts=[10000,20000,30000,40000]
count=0

print("WELCOME TO OUR ATM")
while True:
    user=input("\nEnter User name :")
    user=user.lower()
    if user in users:
        if user==users[0]:
            n=0
            break
        elif user==users[1]:
            n=1
            break
        else:
            n=2
            break
    else:
        print("\nInvalid user name")

while count<3:
    pin=input("\nEnter your pin :")
    if pin.isdigit():
        if user=='sugi':
            if pin==pins[0]:
                break
            else:
                count+=1
                print("\nInvalid pin")
        if user=='sabare':
            if pin==pins[1]:
                break
            else:
                count+=1
                print("\nInvalid pin")
        if user=='malarkodi':
            if pin==pins[2]:
                break
            else:
                count+=1
                print("\nInvalid pin")
        if user=='arjun':
            if pin==pins[3]:
                break
            else:
                count+=1
                print("\nInvalid pin")
    else:
        count+=1
        print("\nInvalid pin number")

if count==3:
    print("\n3 unsuccesfull attempts your card will be lock for 2 days")
    exit()

print("Login succesfull")


while True:
    option=input("\nSelect from following optins: \nStatement__(S) \nWithdraw___(W) \nLodgement__(L)  \nChange PIN_(P)  \nQuit_______(Q) \nType The Letter Of Your Choices: \n")
    option=option.lower()
    valid_option=['s','w','l','p','q']

    if option=='s':
        print(str.capitalize(user[n]),'you have',amounts[n],'amount in your account')
    elif option=='w':
        cash_out=int(input("\nEnter the amount"))
        if cash_out>10000:
            print("\namount must less then the 10000")
        elif cash_out>amounts[n]:
            print("\nYou have insufficiant balance")
        else:
            amounts[n]=amounts[n]-cash_out
            print("\nNow your new balance is",amounts[n])
    elif option=='l':
        cash_in=int(input("\nEnter amount you whant to lodge"))
        if cash_in>10000:
            print("\nAmount must be lessthan 10000")
        else:
            amounts[n]=amounts[n]+cash_in
            print("\nYour new balance is",amounts[n])
    elif option=='p':
        new_pin = str(getpass.getpass("\nEnter a new PIN: "))
        if new_pin.isdigit() and new_pin != pins[n] and len(new_pin) == 4:
            new_ppin = str(getpass.getpass("\nConfirim new PIN: "))
            if new_ppin != new_pin:
                print("\nPin missmatch")
            else:
                pins[n]=new_pin
                print("\nThe new pin was saved succesfully")
        else:
            print("\nNew pin must be 4 number")
    elif option=='q':
        quit()
    else:
        print("\nOption dess not match")