isintance bug with Python 2.4.4 | django.core.urlresolvers.RegexURLResolver affected

[pavl]

Inside "django.core.urlresolvers.RegexURLResolver" at line:

    def _populate(self):
...
            if isinstance(pattern, RegexURLResolver)

The method isinstance, under Python 2.4.4, does not work properly.

I got the exception: 'RegexURLResolver' object has no attribute 'name' at line:

            else:
...
                lookups.appendlist(pattern.name, (bits, p_pattern))

where a pattern was:

pattern   <RegexURLResolver oteracapital.apps.localeflatpages.urls (None:None) >

Which means that if isinstance(pattern, RegexURLResolver) returned False in that case.

In my opinion you should force the installation of latest Python 2.x to avoid such problem.

[Alex Gaynor]

Uhh, that's a pretty lofty accusation that isinstance is broken in python 2.4.4, do you have a citation, or *how* exactly it is broken?

[pavl]

Just to be clear here, I wasn't saying that the bug came from Python itself but from Django. I am sorry if there was a misunderstood.

On DEV, with Python 2.6.5, I got no error what so ever.
On production server, with Python 2.4.4, I get the error.

The test below fails to see that 'pattern' is a RegexURLResolver object:

if isinstance(pattern, RegexURLResolver)

where pattern is:

pattern   <RegexURLResolver oteracapital.apps.localeflatpages.urls (None:None) >

I have this exception when I use the resolver function inside a view with a pattern like: 'namespace:name'.
I will upload the code tomorrow for more details.

[Russell Keith-Magee]

Extraordinary claims require extraordinary proof. Given that this ticket provides no specific evidence of the claim, I'm closing it invalid.

Please reopen if you can provide a specific test case or example that fails under Python 2.4.4, but not under other versions of Python.

[pavl]

I appologize about this ticket.

I investiguated more and found out that the bug came from the application's installation.
Nothing about Django or Python fault.


Django was visible on PYTHONPATH via a system link inside the application directory. That means all django module were mapped to: <application directory>.django...


This is bad, and believe me... I feel bad. :S - yes you can laugh.