Soren Hansen <so...@linux2go.dk> added the comment:
2011/6/4 Benjamin Peterson <rep...@bugs.python.org>:
> 2011/6/4 Soren Hansen <rep...@bugs.python.org>:
>> So my question is: If this change stays (which seems clear given that the
>> only changes proposed here are ways of relaxing the type requirement of the
>> __dir__ method's return value, not reverting the change altogether), and I
>> have an old-style class with a __getattr__ defined, how do I make that class
>> return whatever it would have usually returned for __dir__()?
>
> Yes, this is a limitation of magic methods on old style classes. The
> usual method is something like this:
>
> def __getattr__(self, name):
> if name == "__dir__":
> return self.__dir__
> # Other stuff
>
> Of course, the best fix is to use new-style classes. :)
If I do this:
===== test.py ======
class Foo:
def __getattr__(self, name):
if name == '__dir__':
return self.__dir__
return 'something else'
a = Foo()
print dir(a)
====================
After a lot of this:
File "test.py", line 4, in __getattr__
return self.__dir__
File "test.py", line 4, in __getattr__
return self.__dir__
File "test.py", line 4, in __getattr__
return self.__dir__
...I end up with a "RuntimeError: maximum recursion depth exceeded". I
can't say I'm surprised :)
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12248>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
