main3.py

class BankAccount:
 def __init__(self, account_number, 
              account_holder_name,
              initial_balance=0.0):
    self.__account_number = account_number
    self.__account_holder_name = account_holder_name 
    self.__account_balance = initial_balance

 def  deposit(self, amount):
  if amount > 0:
     self.__account_balance += amount
     self.__account_balance = self.__account_balance+amount
     print("Deposited ₹{}. new balance: ₹{}".format(amount,self.__account_balance))
  else:
     print("Invalid deposit amount")

 def withdraw(self, amount):
  if amount > 0 and amount  <= self.__account_balance:
     self.__account_balance -= amount
     print("withdraw ₹{}. new balance: ₹{}".format(amount,self.__account_balance))
 
  else:
    print("invalid withdraw amount or insufficient balance.")

 def display_balance(self):
    print("account balance for {} (account #{}): ₹{}".format(self.__account_number,
                                                              self.__account_holder_name, 
                                                               self.__account_balance))
    
account = BankAccount(account_number = "9659646565",
                 account_holder_name = "yogeta",
                 initial_balance = 9999.9
                          )
#account 
account.display_balance()
account.deposit(1.1) 
account.withdraw(500.0)
account.withdraw(1.0)