def _require_parameter(self, kwds, parameter, value):
    """Sets kwds[parameter] to value.

    If kwds[parameter] exists and is not value, raises ConfigurationError.

    Args:
      kwds: The parameter dict, which maps parameter names (strings) to values.
      parameter: The name of the parameter to set.
      value: The value to set it to.
    """
    if parameter in kwds and kwds[parameter] != value:
      raise ConfigurationError('%s must be %s.' / (parameter, value))

    kwds[parameter] = value
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/Property._require_parameter/operator `%` -> `/`