避免使用两个不同的数字子类(int和long)？

Question

在基本上处理自定义枚举类型实现时,我遇到了这样一种情况:我必须从两者中派生出单独但几乎相同的子类int,long因为它们是Python中的不同类.这似乎有点讽刺意味,因为两者的实例通常可以互换使用,因为大多数情况下它们只是在需要时自动创建.

我的工作很好,但本着DRY(不要重复自己)的精神,我不禁想知道是否有更好的,或者至少更简洁的方式来实现这一点.目标是让子类实例可以在任何地方使用 - 或尽可能接近 - 它们的基类实例可以使用.理想情况下,这应该自动发生,类似于内置int()实际返回的方式,long只要它检测到一个是必需的.

这是我目前的实施:

class NamedInt(int):
    """Subclass of type int with a name attribute"""
    __slots__ = "_name"  # also prevents additional attributes from being added

    def __setattr__(self, name, value):
        if hasattr(self, name):
            raise AttributeError(
                "'NamedInt' object attribute %r is read-only" % name)
        else:
            raise AttributeError(
                "Cannot add attribute %r to 'NamedInt' object" % name)

    def __new__(cls, name, value):
        self = super(NamedInt, NamedInt).__new__(cls, value)
        # avoid call to this subclass's __setattr__
        super(NamedInt, self).__setattr__('_name', name)
        return self

    def __str__(self):  # override string conversion to be name
        return self._name

    __repr__ = __str__


class NamedLong(long):
    """Subclass of type long with a name attribute"""
    # note: subtypes of variable length 'long' type can't have __slots__

    def __setattr__(self, name, value):
        if hasattr(self, name):
            raise AttributeError(
                "NamedLong object attribute %r is read-only" % name)
        else:
            raise AttributeError(
                "Cannot add attribute %r to 'NamedLong' object" % name)

    def __new__(cls, name, value):
        self = super(NamedLong, NamedLong).__new__(cls, value)
        # avoid call to subclass's __setattr__
        super(NamedLong, self).__setattr__('_name', name)
        return self

    def __str__(self):
        return self._name  # override string conversion to be name

    __repr__ = __str__

class NamedWholeNumber(object):
    """Factory class which creates either a NamedInt or NamedLong
    instance depending on magnitude of its numeric value.
    Basically does the same thing as the built-in int() function
    does but also assigns a '_name' attribute to the numeric value"""
    class __metaclass__(type):
        """NamedWholeNumber metaclass to allocate and initialize the
           appropriate immutable numeric type."""
        def __call__(cls, name, value, base=None):
            """Construct appropriate Named* subclass."""
            # note the int() call may return a long (it will also convert
            # values given in a string along with optional base argument)
            number = int(value) if base is None else int(value, base)

            # determine the type of named numeric subclass to use
            if -sys.maxint-1 <= number <= sys.maxint:
                named_number_class = NamedInt
            else:
                named_number_class = NamedLong

            # return instance of proper named number class
            return named_number_class(name, number)