[Python-Dev] Re: [Python-checkins] python/dist/src/Lib pprint.py, 1.24, 1.25

2003年6月08日 18:57:01 +0200

At 18:09 08.06.2003 +0200, Gerrit Holl wrote:
>Hi,
>>Alex Martelli wrote:
> > > if issubclass(typ, dict) and type(typ.__repr__) is 
> type(dict.__repr__):
> > > # do stuff
> >
> > Aren't the calls to type() here wrong? It seems to me that what you want
> > to check is just whether typ.__repr__ is dict.__repr__, not if the 
> types of
> > the two bound methods are the same.
>>I was confused: I thought methods were dynamically created, but that is
>only true for bound methods, not for unbound methods. typ.__repr__ is
>dict.__repr__ is correct indeed.
>>yours,
>Gerrit.

no it's true also for unbound methods but dict.__repr__ isn't either:
 >>> class C(object):
... def f(self): pass
...
 >>> C.f is C.f
0
 >>> C.f
<unbound method C.f>
 >>> dict.__repr__
<slot wrapper '__repr__' of 'dict' objects>
 >>>
the problem is that the nature of dict.__repr__ is kind of an 
implementation detail.
regards.