For sequences, (strings, lists, tuples), use the fact that empty sequences are false

[shu, xinxin]

For sequences, (strings, lists, tuples), use the fact that empty sequences are false(PEP 8 Programming Recommendations)

Yes: if not seq:
     if seq:

No: if len(seq)
    if not len(seq)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24958

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/24958
Committed: http://github.com/openstack/quantum/commit/b1067c94c53e22cc9f8400cf7b2049e35d06877b
Submitter: Jenkins
Branch: master

commit b1067c94c53e22cc9f8400cf7b2049e35d06877b
Author: shu,xinxin <email address hidden>
Date: Thu Mar 21 18:48:00 2013 +0800

    use the fact that empty sequences are false

    fixed bug #1156473

    Change-Id: I43470eb884107111cbea958868f4cf8241c8d6e6