code: def create(self, password, username, realm=None):
          
          if not isinstance(username, basestring):
              raise ValueError("Invalid name: %s" % repr(username))
  
          if realm is None:
              response = self.post(password=password, name=username)
          else:
              response = self.post(password=password, realm=realm, name=username)
  
          if response.status != 201:
              raise ValueError("Unexpected status code %s returned from creating a stanza" % response.status)
  
          entries = _load_atom_entries(response)
          state = _parse_atom_entry(entries[0])
          storage_password = StoragePassword(self.service, self._entity_path(state), state=state, skip_refresh=True)
  
          return storage_password
docs: Creates a storage password.
  
          A `StoragePassword` can be identified by <username>, or by <realm>:<username> if the
          optional realm parameter is also provided.
  
          :param password: The password for the credentials - this is the only part of the credentials that will be stored securely.
          :type name: ``string``
          :param username: The username for the credentials.
          :type name: ``string``
          :param realm: The credential realm. (optional)
          :type name: ``string``
  
          :return: The :class:`StoragePassword` object created.