python中property(lambda self: object())简单解释

Posted 2021-02-27 skyone1

最后4行lambda。问题是：如何运作？它们的含义和结果是什么？您能否以简单的方式显示该声明的示例？现在谢谢！

class error(Exception):
    """ Base class for I/O related errors. """
    def __init__(self, *args, **kwargs): # real signature unknown
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more): # real signature unknown; restored from __doc__
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __reduce__(self, *args, **kwargs): # real signature unknown
        pass

    def __str__(self): # real signature unknown; restored from __doc__
        """ x.__str__() <==> str(x) """
        pass

    characters_written = property(lambda self: object()) # default
    errno = property(lambda self: object()) # default
    filename = property(lambda self: object()) # default
    strerror = property(lambda self: object()) # default

1个

property是内置的。通常用作装饰器。该代码与此等效，可能看起来更加熟悉：

class error(Exception):
    #...
    @property
    def characters_written(self):
        return object()

    @property
    def errno(self):
        return object()

    @property
    def filename(self):
        return object()

    @property
    def strerror(self):
        return object()