Skip Montanaro wrote:
> On Thu, Apr 20, 2017 at 3:19 PM, Peter Otten <__pete...@web.de> wrote:
>
>> If being helpful really is the only purpose of the metaclass you can
>> implement a SomeClass.__dir__() method instead:
>>
>> def __dir__(self):
>> names = dir(self._instance)
>> # <snip whatever post-processing you want>
>> return names
>>
>
> Thanks. That would probably get me halfway home in Python 3, but appears
> to have no effect in Python 2. It wouldn't solve the missing attributes in
> help()/pydoc either.
OK, looks like I messed up.
Another round, this time with a metaclass. As you have found partial() does
not work as a method because it's not a descriptor (i. e. no __get__()
method). Instead you can try a closure:
def make_method(a):
underlying = getattr(SomeOtherClass, a)
@functools.wraps(underlying)
def _meth(self, *args, **kw):
return underlying(self._instance, *args, **kw)
return _meth
class SomeMeta(type):
def __new__(cls, name, parents, dct):
for a in dir(SomeOtherClass):
if a[0] == "_": continue
dct[a] = make_method(a)
return super(SomeMeta, cls).__new__(cls, name, parents, dct)
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