def validate(self, value):
    """Validate property.

    Returns:
      A valid value.

    Raises:
      BadValueError if property is not an instance of data_type.
    """
    if value is not None and not isinstance(value, self.data_type):
      try:
        value = self.data_type(value)
      except __HOLE__, err:



        raise BadValueError('Property %s must be convertible '
                            'to a %s instance (%s)' %
                            (self.name, self.data_type.__name__, err))
    value = super(UnindexedProperty, self).validate(value)
    if value is not None and not isinstance(value, self.data_type):
      raise BadValueError('Property %s must be a %s instance' %
                          (self.name, self.data_type.__name__))
    return value
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/db/__init__.py/UnindexedProperty.validate