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[Bug 1538518] Re: Avoid using `len(x)` to check if x is empty

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Ren Qiaowei <qiaowei.ren@xxxxxxxxx>
Date: Sat, 06 Feb 2016 04:38:08 -0000
Reply-to: Bug 1538518 <1538518@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: nova
   Importance: Undecided
       Status: New

** Changed in: nova
     Assignee: (unassigned) => Ren Qiaowei (qiaowei-ren)

** Changed in: nova
       Status: New => In Progress

** Also affects: swift
   Importance: Undecided
       Status: New

** Changed in: swift
     Assignee: (unassigned) => Ren Qiaowei (qiaowei-ren)

** Changed in: swift
       Status: New => In Progress

** Also affects: glance
   Importance: Undecided
       Status: New

** Changed in: glance
     Assignee: (unassigned) => Ren Qiaowei (qiaowei-ren)

** Changed in: glance
       Status: New => In Progress

** Also affects: cinder
   Importance: Undecided
       Status: New

** Changed in: cinder
     Assignee: (unassigned) => Ren Qiaowei (qiaowei-ren)

** Changed in: cinder
       Status: New => In Progress

** Also affects: ceilometer
   Importance: Undecided
       Status: New

** Changed in: ceilometer
     Assignee: (unassigned) => Ren Qiaowei (qiaowei-ren)

** Changed in: ceilometer
       Status: New => In Progress

** Also affects: neutron
   Importance: Undecided
       Status: New

** Changed in: neutron
     Assignee: (unassigned) => Ren Qiaowei (qiaowei-ren)

** Changed in: neutron
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1538518

Title:
  Avoid using `len(x)` to check if x is empty

Status in Ceilometer:
  In Progress
Status in Cinder:
  In Progress
Status in Glance:
  In Progress
Status in neutron:
  In Progress
Status in OpenStack Compute (nova):
  In Progress
Status in Rally:
  In Progress
Status in OpenStack Object Storage (swift):
  In Progress

Bug description:
  `len()` is used to check if collection (e.g., a dict, list, set, etc.)
  has items. As collections have a boolean representation too, it is
  better to directly check for true / false.

  rally/common/utils.py
  rally/task/utils.py
  rally/task/validation.py
  tests/unit/doc/test_specs.py

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