gistfile1.py

    def filter_value_to_python(self, value, field_name, filters=None,
            filter_expr=None, filter_type=None):
        """
        Turn the string ``value`` into a python object.
        """
        # Simple values
        if value in ['true', 'True', True]:
            return True
        elif value in ['false', 'False', False]:
            return False
        elif value in ('nil', 'none', 'None', None):
            return None

        # Split on ',' if not empty string and either an in or range filter.
        if filter_type in ('in', 'range') and len(value):
            if hasattr(filters, 'getlist'):
                value = []

                for part in filters.getlist(filter_expr):
                    value.extend(part.split(','))
            else:
                value = value.split(',')

            to_python = self.filter_value_to_python
            # We just use None to ensure the to_python call is just a
            # string -> python object conversion.
            return [to_python(v, field_name, None, None, None) for v in value]

        # Attempt to use the associated Field object to convert the value to a
        # python object.
        try:
            value = self.fields[field_name].convert(value)
        except:
            pass

        return value