old_contents: class BankAccount(object):
      def __init__(self, initial_balance=0):
          self.balance = initial_balance
      def deposit(self, amount):
          self.balance = self.balance + amount
      def withdraw(self, amount):
          self.balance = self.balance - amount
      def overdrawn(self):
          return self.balance < 0
  print BankAccount
  my_account = BankAccount(15)
  print my_account
  my_account.withdraw(5)
  print my_account.balance
  
new_contents: # -*- coding: utf-8 -*-
  
  class BankAccount(object):
  
      def __init__(self, initial_balance=0):
  
          self.balance = initial_balance
  
      def deposit(self, amount):
  
          self.balance = self.balance + amount
  
      def withdraw(self, amount):
  
          self.balance = self.balance - amount
  
      def overdrawn(self):
  
          return self.balance < 0
  
  
  print BankAccount
  my_account = BankAccount(15)
  print my_account
  my_account.withdraw(5)
  print my_account.balance
  
subject: Add pep8 and encode