criteria.py 文件源码

def visit_UnaryOp(self, node):
        if type(node.op) not in (ast.Not,):
            raise SyntaxError("%s is not supported" % type(node.op))

        self.visit(node.operand)
        obj = self.data.pop()
        criteria = obj if isinstance(obj, Criteria) else criteria_class.instance(Const.Bool, obj)

        cls = criteria_class.lookup(ast_op_to_criteria.lookup(type(node.op)))
        criteria = cls(criteria)
        self.data.append(criteria)