def __getattr__(self, attr):
        # XXX this is a fallback mechanism to guard against these
        # methods getting called in a non-standard order.  this may be
        # too complicated and/or unnecessary.
        # XXX should the __r_XXX attributes be public?
        if attr[:12] == '_Request__r_':
            name = attr[12:]
            if hasattr(Request, 'get_' + name):
                getattr(self, 'get_' + name)()
                return getattr(self, attr)
        raise AttributeError, attr

this may cause "maximum recursion depth exceeded"

>>> import urllib2
>>> req = urllib2.Request('http://www.nbc.com')
>>> req._Request__r_method
RuntimeError: maximum recursion depth exceeded

"return getattr(self, attr)"? should it be removed?

That __getattr__ was removed in r70815 and in Python 3.1 it's OK.
The change wasn't backported to the trunk though.

Assigning to Jeremy to see what he thinks about it.

Ok.  I'll take a look, too.

Jeremy

On Sat, Feb 27, 2010 at 4:30 AM, Ezio Melotti <report@bugs.python.org> wrote:
>
> Changes by Ezio Melotti <ezio.melotti@gmail.com>:
>
>
> ----------
> nosy: +orsenthil
> status: pending -> open
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue6500>
> _______________________________________
>

Here is a patch for 2.7. I don't think backporting 9eceb618274a to 2.7  is worth the effort for this, so I just fixed the __getattr__ method and added a test.

Thank you Ezio, I'll commit this tomorrow.

New changeset fbea8ff8db5e by Berker Peksag in branch '2.7':
Issue #6500: Fix "maximum recursion depth exceeded" error caused by Request.__getattr__()
https://hg.python.org/cpython/rev/fbea8ff8db5e

Hi @Berker,

This patch breaks the unit tests. Could you confirm (or reject) this?
Thanks

New changeset e2faa18802bb by Berker Peksag in branch '2.7':
Issue #6500: Reverting fbea8ff8db5e since it broke tests
https://hg.python.org/cpython/rev/e2faa18802bb

Thanks, Senthil. I've just reverted fbea8ff8db5e. Sorry for the noise!

__getattr__() was purposed to handle two lazily created private attributes: __r_type and __r_host. They are set in corresponding get_-methods.

Here is a patch that makes __getattr__() to handle only these attributes.

@Serhiy, the patch looks good to me. This change is an excellent idea. Please commit it.

New changeset d34fdd1736f2 by Serhiy Storchaka in branch '2.7':
Issue #6500: Fixed infinite recursion in urllib2.Request.__getattr__().
https://hg.python.org/cpython/rev/d34fdd1736f2

Thank you for the review Senthil.