input: Write a python function to create a bank account, deposit money, and withdraw money.
  assert account1.ownerName == "John"
  assert account1.balance == 1300
  account1.deposit(200)
  assert account1.balance == 1500
  account1.withdraw(100)
  assert account1.balance == 1400
output: class BankAccount:
      def __init__(self, ownerName, balance=0):
          self.ownerName = ownerName
          self.balance = balance
  
      def deposit(self, amount):
          if amount > 0:
              self.balance += amount
  
      def withdraw(self, amount):
          if 0 < amount <= self.balance:
              self.balance -= amount
  
  account1 = BankAccount("John", 1300)