This wasn't that tricky. I think I will modify this behave more like an ATM than just an account. It will allow the user to interact and specify withdraw/deposit amounts. I will also require a pin for their account. I can make it so different users can store their pins.

bankaccount.py

''' A bank account experience that allows you to view the balance of, deposit to and withdraw from your account'''

class BankAccount(object):
  balance = 0
  def __init__(self,name):
    self.name = name
    
  def __repr__(self):
    return "%s's account. Balanace: %.2f" %(self.name, self.balance)

  def show_balance(self):
    print "Balance: %.2f" % self.balance
    
  def deposit(self, amount):
    if amount <= 0:
      print "You can't deposit that amount"
      return
    else:
      print "Depositing $%.2f..." % amount
      self.balance += amount
      self.show_balance()
      
  def withdraw(self, amount):
    if amount >self.balance:
      print "You can't withdraw that amount"
      return
    else:
      print "Withdrawing $%.2f..." % amount
      self.balance -= amount
      self.show_balance()
      
my_account = BankAccount("Jasmine")
print my_account
my_account.show_balance()
my_account.deposit(2000)
my_account.withdraw(1000)
print my_account