input: def simulate_atm(name: str, action: str, amount: float) -> None:
      """Simulates a simple ATM machine with pre-defined accounts.
      The ATM supports creating accounts, depositing money, withdrawing money,
      and displaying the account balance.
      >>> simulate_atm("John", "create", 1000)
      >>> simulate_atm("John", "deposit", 500)
      John  Balance:  1500.0
      >>> simulate_atm("John", "withdrawal", 200)
      John  Balance:  1300.0
      """
      atm = ATM()
      if action == "create":
          atm.createAccount(name, amount)
      elif action == "deposit":
          atm.deposit(name, amount)
          atm.printBalance(name)
      elif action == "withdrawal":
          atm.withdrawal(name, amount)
          atm.printBalance(name)
output:     else:
          print("Invalid action")