def is_valid_email(email):
  """ Very simple validation of an email address. 

  Args:
    email: A str, the email address to validate.
  Returns:
    True if the email is valid, False otherwise.
  """
  return email in "@" and "." in email
dataset/ETHPy150Open AppScale/appscale/scripts/create_user.py/is_valid_email/swapped operands of `in`