ERROR: 'Namespace' object has no attribute 'func'

[Johannes Erdfelt]

When running just 'nova' under Python 2, you get the usage (same as 'nova help').

When running just 'nova' under Python 3, you get the error: ERROR: 'Namespace' object has no attribute 'func'

This is because map() is used to decode sys.argv, but under Python 3 it returns a map object which is an iterable. Some code later tries to use this in a boolean context and it will always return True, even if it's empty.

Python 2 would return a list from the map built-in which is why it doesn't exhibit this failure.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/81911

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/81911
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=656cf91f898ff1a20986f358bedc64f410f5ee4a
Submitter: Jenkins
Branch: master

commit 656cf91f898ff1a20986f358bedc64f410f5ee4a
Author: Johannes Erdfelt <email address hidden>
Date: Thu Mar 20 13:29:10 2014 -0700

    Fix error when run with no arguments on Python 3

    Python 3 changed the map built-in to return an iterable instead of a list.
    When tested in a boolean context, this always returns True, even if it
    would not return anything when iterated.

    Instead of the usage being printed, this error was printed:
    ERROR: 'Namespace' object has no attribute 'func'

    Use list comprehension instead to ensure that an iterable isn't returned

    Change-Id: Ie15f2fa8ee93ab26490e371133fa0f944430737b
    Closes-bug: 1295356

[XavierAntoviaque (xavier-antoviaque)]

I also get this with glance on Python 3:

$ python --version
Python 3.4.3

$ pip freeze |grep glance
python-glanceclient==1.1.0

$ glance image-create --disk-format=qcow2 --container-format=bare --file=~/dl/precise-server-cloudimg-amd64-disk1.img --name=ubuntu-12.04-ref-ul
'Namespace' object has no attribute 'func'

[ZhiQiang Fan (aji-zqfan)]

fix for glanceclient: https://review.openstack.org/#/c/228256/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/228257

[ZhiQiang Fan (aji-zqfan)]

patch https://review.openstack.org/224565 can fix python-magnumclient as well

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/228257
Committed: https://git.openstack.org/cgit/openstack/python-saharaclient/commit/?id=d7cad3a7c337a4adcabfa577070b9f715d69e30b
Submitter: Jenkins
Branch: master

commit d7cad3a7c337a4adcabfa577070b9f715d69e30b
Author: Zhiqiang Fan <email address hidden>
Date: Sun Sep 27 10:06:59 2015 -0600

    print usage when no argument is specified for python3

    When running just sahara' under python3, we will get the error:
    ERROR: b"'Namespace' object has no attribute 'func'"

    This is because map() is used to decode sys.argv, but under Python3
    it returns a map object which is an iterable. Some code later tries
    to use this in a boolean context and it will always return True,
    even if it's empty.

    Change-Id: I508b093e30814645b2bd4c32cf469204bb696207
    Closes-Bug: #1295356

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/228256
Committed: https://git.openstack.org/cgit/openstack/python-glanceclient/commit/?id=a8a7c689905f816db0e73e3cf643cd5daef76932
Submitter: Jenkins
Branch: master

commit a8a7c689905f816db0e73e3cf643cd5daef76932
Author: Zhiqiang Fan <email address hidden>
Date: Sun Sep 27 09:38:04 2015 -0600

    print usage when no argument is specified for python3

    When running just 'glance' under python3, we will get the error:
    ERROR: 'Namespace' object has no attribute 'func'

    This is because map() is used to decode sys.argv, but under Python3
    it returns a map object which is an iterable. Some code later tries
    to use this in a boolean context and it will always return True,
    even if it's empty.

    Change-Id: I2f03e462cb813833b75b9f2de7badd10b10cddff
    Closes-Bug: #1295356

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/python-saharaclient 0.12.0 release.