default repr?

Mon Jul 23 09:14:29 EDT 2012

On 23 July 2012 01:24, Steven D'Aprano <steve+comp.lang.python at pearwood.info
> wrote:

> On 2012年7月23日 08:54:00 +1000, Chris Angelico wrote:
>> > On Mon, Jul 23, 2012 at 8:48 AM, Dan Stromberg <drsalists at gmail.com>
> > wrote:
> >> If a class has defined its own __repr__ method, is there a way of
> >> getting the default repr output for that class anyway?
>> If the class, call it C, is a subclass of some other class (or classes),
> then there is also the repr of the parent. You can get to that by calling
> parent.__repr__(instance), although there are some subtleties.
>> In Python 2, there are old-style or classic classes that don't inherit
> from anything else. I don't believe there is any way to get the repr of a
> classic class with no __repr__ method *except* from an instance with no
> __repr__ method. So the answer for C below will be No:
>> # Python 2.x
> class C:
> def __repr__(self):
> return "C()"
>
You coudl always implement repr yourself:
def repr_oldstyle(obj):
 mod = obj.__class__.__module__
 cls = obj.__class__.__name__
 mem = '0x' + hex(id(obj))[2:].zfill(8).upper()
 return '<{0}.{1} instance at {2}>'.format(mod, cls, mem)
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