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I encountered the same problem.
The solution Salvatore says or python setup.py develop for donwloaded
oslo-config tarball resolved the problem.

In addtion, currios to say, the current oslo config works fine with
the fresh install of Ubuntu 12.04.
I confirm it with devstack. This problem seems to occur when quantum
is updated from the previous version.

Thanks,
Akihiro

2013/2/19 Salvatore Orlando <sorlando at nicira.com>:
> Indeed. This what was looking weird to me, and the reason for which I
> think I'm doing something dumb.
> Basically there are many quantum imports that do
>
> from oslo.config import cfg
>
> and this import fails (on all my 3 dev machines)
>
> I am providing more details below so you can tell me what I'm not doing right.
> This is what happens (and my default sys.path which includes oslo's directory):
>
>
>>>> import sys
>>>> sys.path
> ['', '/usr/local/lib/python2.7/dist-packages/alembic-0.4.2-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/tox-1.4.2-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/py-1.4.12-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/virtualenv-1.8.4-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/WebOb-1.2.3-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/unittest2-0.5.1-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/pep8-1.4.2-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/netaddr-0.7.10-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/mock-1.0.1-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/cliff-1.3-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/prettytable-0.6.1-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/fixtures-0.3.12-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/testtools-0.9.29-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/extras-0.0.3-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/openstack.common-2013.1.a172.g8ce5947-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.7.9-py2.7-linux-x86_64.egg',
> '/usr/local/lib/python2.7/dist-packages/stevedore-0.8-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/kombu-1.0.4-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/anyjson-0.2.4-py2.7.egg',
> '/usr/local/lib/python2.7/dist-packages/greenlet-0.4.0-py2.7-linux-x86_64.egg',
> '/usr/local/lib/python2.7/dist-packages/oslo_config-2013.1b3-py2.7.egg',
> '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2',
> '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old',
> '/usr/lib/python2.7/lib-dynload',
> '/usr/local/lib/python2.7/dist-packages',
> '/usr/lib/python2.7/dist-packages',
> '/usr/lib/python2.7/dist-packages/PIL',
> '/usr/lib/python2.7/dist-packages/gst-0.10',
> '/usr/lib/python2.7/dist-packages/gtk-2.0',
> '/usr/lib/pymodules/python2.7',
> '/usr/lib/python2.7/dist-packages/ubuntu-sso-client',
> '/usr/lib/python2.7/dist-packages/ubuntuone-client',
> '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel',
> '/usr/lib/python2.7/dist-packages/ubuntuone-couch',
> '/usr/lib/python2.7/dist-packages/ubuntuone-installer',
> '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol']
>>>> from oslo.config import cfg as config
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named oslo.config
>>>> quit()
>
>
> Then I do the following, probably horrible thing:
>
> salvatore at ubuntu:~$ sudo touch
> /usr/local/lib/python2.7/dist-packages/oslo_config-2013.1b3-py2.7.egg/oslo/__init__.py
>
> And the import works
>
> salvatore at ubuntu:~$ python
> Python 2.7.3 (default, Aug  1 2012, 05:14:39)
> [GCC 4.6.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from oslo.config import cfg as config
>>>> type(config.CONF)
> <class 'oslo.config.cfg.ConfigOpts'>
>>>>
>
>
>
>
> On 18 February 2013 16:19, Doug Hellmann <doug.hellmann at dreamhost.com> wrote:
>> On Mon, Feb 18, 2013 at 8:58 AM, Salvatore Orlando <sorlando at nicira.com>
>> wrote:
>>>
>>> Hi,
>>>
>>> After updating my Quantum code with the one which uses oslo as a
>>> dependency, making the source tree incredibly slimmer, I saw Quantum
>>> was still failing in importing oslo, even if it was correctly in the
>>> pip-requires (and I did re-install the package).
>>>
>>> Oslo also showed up correctly in
>>> /usr/local/lib/python2.7/dist-packages/oslo_config-2013.1b3-py2.7.egg
>>> I wondered why the import was failing and I found no __init__.py in
>>> the oslo folder. This was easily fixed, but I am still not able to
>>> understand what I did wrong (I just did sudo easy_install
>>> <tarball_url>), since everything looks fine in the tarball.
>>
>>
>> Oslo is a namespace package, so it shouldn't be imported directly and
>> doesn't need an __init__.py.
>>
>> What import was failing and what was the traceback?
>>
>> Doug
>>
>>>
>>>
>>> Regards, and thanks in advance,
>>> Salvatore
>>>
>>> _______________________________________________
>>> OpenStack-dev mailing list
>>> OpenStack-dev at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>
>>
>>
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>>
>
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-- 
Akihiro MOTOKI <amotoki at gmail.com>