Adds a $where clause to this query.

        The `code` argument must be an instance of :class:`basestring`
        (:class:`str` in python 3) or :class:`~bson.code.Code`
        containing a JavaScript expression. This expression will be
        evaluated for each document scanned. Only those documents
        for which the expression evaluates to *true* will be returned
        as results. The keyword *this* refers to the object currently
        being scanned.

        Raises :class:`TypeError` if `code` is not an instance of
        :class:`basestring` (:class:`str` in python 3). Raises
        :class:`~pymongo.errors.InvalidOperation` if this
        :class:`Cursor` has already been used. Only the last call to
        :meth:`where` applied to a :class:`Cursor` has any effect.

        :Parameters:
          - `code`: JavaScript expression to use as a filter

def where(self, code):
        """Adds a $where clause to this query.

        The `code` argument must be an instance of :class:`basestring`
        (:class:`str` in python 3) or :class:`~bson.code.Code`
        containing a JavaScript expression. This expression will be
        evaluated for each document scanned. Only those documents
        for which the expression evaluates to *true* will be returned
        as results. The keyword *this* refers to the object currently
        being scanned.

        Raises :class:`TypeError` if `code` is not an instance of
        :class:`basestring` (:class:`str` in python 3). Raises
        :class:`~pymongo.errors.InvalidOperation` if this
        :class:`Cursor` has already been used. Only the last call to
        :meth:`where` applied to a :class:`Cursor` has any effect.

        :Parameters:
          - `code`: JavaScript expression to use as a filter
        """
        self.__check_okay_to_chain()
        if not isinstance(code, Code):
            code = Code(code)

        self.__spec["$where"] = code
        return self