evmapper.py

    def map_comparison(self, expr, *args, **kwargs):
        return type(expr)(
                self.rec(expr.left, *args, **kwargs),
                expr.operator,
                self.rec(expr.right, *args, **kwargs))

    def map_logical_not(self, expr, *args, **kwargs):
        return type(expr)(
                self.rec(expr.child, *args, **kwargs))

    def map_logical_or(self, expr, *args, **kwargs):
        return type(expr)(tuple(
            self.rec(child, *args, **kwargs) for child in expr.children))

    map_logical_and = map_logical_or