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This bug was fixed in the package python-pip - 8.1.2-2ubuntu0.1

---------------
python-pip (8.1.2-2ubuntu0.1) yakkety; urgency=medium

  * d/tests:
    - control: Add needs-recommends restriction. (LP: #1626258)
    - pip2-*.sh: Install world 3.1, it's the latest version compatible
      with python2.

 -- Felipe Reyes <felipe.reyes@xxxxxxxxxxxxx>  Wed, 09 Nov 2016 15:02:34
+0100

** Changed in: python-pip (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1626258

Title:
  [SRU] AttributeError: 'Requirement' object has no attribute
  'project_name'

Status in python-pip package in Ubuntu:
  Fix Released
Status in python-pip source package in Xenial:
  Fix Committed
Status in python-pip source package in Yakkety:
  Fix Released
Status in python-pip source package in Zesty:
  Fix Released
Status in python-pip package in Debian:
  Fix Released

Bug description:
  [impact]

  pip 8.1.1 (xenial) tries to access properties that were dropped from
  the Requirement class and when pip's code tries to access
  Requirement.project_name fails, this was fixed in 8.1.2.

  Any user trying to install a package that triggers the
  pkg_resources.VersionConflict exception during will get the error
  "AttributeError: 'Requirement' object has no attribute 'project_name'"

  [Test Case]

  # wget https://pypi.python.org/packages/49/6f/183063f01aae1e025cf0130772b55848750a2f3a89bfa11b385b35d7329d/requests-2.10.0.tar.gz
  # wget https://pypi.python.org/packages/2e/ad/e627446492cc374c284e82381215dcd9a0a87c4f6e90e9789afefe6da0ad/requests-2.11.1.tar.gz
  # pip install requests-2.10.0.tar.gz
  # pip install requests-2.11.1.tar.gz

  Expected result:

  pip installs requests 2.11.1

  Actual result:

  pip fails with the following exception

  root@pip-x:/home/ubuntu# pip install requests-2.11.1.tar.gz
  Processing ./requests-2.11.1.tar.gz
  Exception:
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 209, in main
      status = self.run(options, args)
    File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 328, in run
      wb.build(autobuilding=True)
    File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 748, in build
      self.requirement_set.prepare_files(self.finder)
    File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 360, in prepare_files
      ignore_dependencies=self.ignore_dependencies))
    File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 600, in _prepare_file
      req_to_install.check_if_exists()
    File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line 1011, in check_if_exists
      self.req.project_name
  AttributeError: 'Requirement' object has no attribute 'project_name'
  You are using pip version 8.1.1, however version 8.1.2 is available.
  You should consider upgrading via the 'pip install --upgrade pip' command.

  [Regression Potential]

  * None, this change is already part of 8.1.2, and most of the change
  is already part of the ubuntu package, there is just one last place
  where the code is accessing Requirement.project_name

  [Other info]

  From 8e236dd6a09bd2f70f9d4fc886da8c354d4c58f2 Mon Sep 17 00:00:00 2001
  From: Donald Stufft <donald@xxxxxxxxx>
  Date: Wed, 11 Nov 2015 18:51:46 -0500
  Subject: [PATCH] Update to use the Requirement class from packaging
  https://github.com/pypa/pip/commit/8e236dd6a09bd2f70f9d4fc886da8c354d4c58f2

  This SRU fixes autopkgtest, so the building process to get into
  -proposed doesn't block it.

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