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[Launchpad Bug Tracker <1445947@xxxxxxxxxxxxxxxxxx>]

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[Impact]

 * Not able show current list of installed packages, e.g. pip freeze.

[Test Case]

1 - install wily/trusty-liberty python-pip package
2 - pip freeze
3 - the following error is shown without the patch

Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/freeze.py", line 74, in run
req = pip.FrozenRequirement.from_dist(dist, dependency_links, find_tags=find_tags)
File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 286, in from_dist
assert len(specs) == 1 and specs[0][0] == '=='
AssertionError 

[Regression Potential]

 * None


The command 'pip3 list' is broken on vivid:

maxb@altimeter:~$ pip3 list
[snip]
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 80, in run
    self.run_listing(options)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 142, in run_listing
    self.output_package_listing(installed_packages)
  File "/usr/lib/python3/dist-packages/pip/commands/list.py", line 151, in output_package_listing
    if dist_is_editable(dist):
  File "/usr/lib/python3/dist-packages/pip/util.py", line 367, in dist_is_editable
    req = FrozenRequirement.from_dist(dist, [])
  File "/usr/lib/python3/dist-packages/pip/__init__.py", line 299, in from_dist
    assert len(specs) == 1 and specs[0][0] == '=='
AssertionError

The problem is that the version string of python-apt is not PEP 440
compliant.  Avoiding this crash is already fixed with a one-line patch
upstream. Please consider cherry-picking
https://github.com/pypa/pip/commit/6cab71f422f2425b4d2283023c9e955f9663dde6
into Vivid's pip.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: python3-pip 1.5.6-5ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-14.14-generic 3.19.3
Uname: Linux 3.19.0-14-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Apr 19 16:55:24 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-05-29 (325 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: python-pip
UpgradeStatus: Upgraded to vivid on 2015-03-29 (20 days ago)

** Affects: ubuntu-translations
     Importance: Undecided
         Status: New

** Affects: python-pip (Ubuntu)
     Importance: Medium
         Status: Fix Released

** Affects: python-pip (Ubuntu Trusty)
     Importance: Medium
         Status: Confirmed

** Affects: python-pip (Ubuntu Wily)
     Importance: Medium
         Status: Fix Released


** Tags: amd64 apport-bug patch sts sts-sru third-party-packages verification-done vivid
-- 
'pip3 list' throws AssertionError
https://bugs.launchpad.net/bugs/1445947
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