小编Jos*_*hua的帖子

我正在尝试编写AST解释器/ REPL.ANTLRv4提供两个非常相似的接口(ParseTreeVisitor和ParseTreeListener)来遍历解析树.我似乎无法找到它们之间的任何重大差异,并且文档相当稀疏.一个界面比另一个更好吗？

我正在尝试创建一个行为类似于包装对象的包装类.到目前为止,我已经提出以下代码:

import functools
import types

method_wrapper = type((None).__str__)

class Box:

    def __new__(cls, obj):
        attrs = {}
        attr_names = dir(obj)

        for attr_name in attr_names:
            attr = obj.__getattribute__(attr_name)

            if isinstance(attr, (types.MethodType, method_wrapper)):
                "Attr is a bound method, ignore self"
                @functools.wraps(attr)
                def wrapped_attr(self, *args, **kwargs):
                    return attr(*args, **kwargs)
                attrs[attr_name] = wrapped_attr

            elif isinstance(attr, types.FunctionType):
                "attr is a static method"
                attrs[attr_name] = staticmethod(attr)

            else:
                "attr is a property"
                attrs[attr_name] = attr

        cls = type(type(obj).__name__,
                   (cls, type(obj)),
                   attrs)

        return object.__new__(cls)

我试过测试它:

if __name__ == '__main__': …