code: def keypair_field_data(request, include_empty_option=False):
      
      keypair_list = []
      try:
          keypairs = api.nova.keypair_list(request)
          keypair_list = [(kp.name, kp.name) for kp in keypairs]
      except Exception:
          exceptions.handle(request, _('Unable to retrieve key pairs.'))
  
      if not keypair_list:
          if include_empty_option:
              return [("", _("No key pairs available")), ]
          return []
  
      if include_empty_option:
          return [("", _("Select a key pair")), ] + keypair_list
      return keypair_list
docs: Returns a list of tuples of all keypairs.
  
      Generates a list of keypairs available to the user (request). And returns
      a list of (id, name) tuples.
  
      :param request: django http request object
      :param include_empty_option: flag to include a empty tuple in the front of
          the list
      :return: list of (id, name) tuples