(self, eval_ctx=None)
Return the value of the expression as constant or raise
        :exc:`Impossible` if this was not possible.

        An :class:`EvalContext` can be provided, if none is given
        a default context is created which requires the nodes to have
        an attached environment.

        .. versionchanged:: 2.4
           the `eval_ctx` parameter was added.
Return the value of the expression as constant or raise
        :exc:`Impossible` if this was not possible.
Return the value of the expression as constant or raise : exc : Impossible if this was not possible .
def as_const(self, eval_ctx=None):
        """Return the value of the expression as constant or raise
        :exc:`Impossible` if this was not possible.

        An :class:`EvalContext` can be provided, if none is given
        a default context is created which requires the nodes to have
        an attached environment.

        .. versionchanged:: 2.4
           the `eval_ctx` parameter was added.
        """
        raise Impossible()
def as_const ( self , eval_ctx = None ) : raise Impossible ( )