pip raises a pkg_resources.VersionConflict exception because colorama is 0.3.7 instead of 0.3.3

[jeffsilverm]

When I try to install awscli under Ubuntu 16.04 and python 3.5.1 (pip3) or python 2.7.11 (pip) I get the VersionConflict exception raised:

root@jeff-desktop:~# pip install awscli
Collecting awscli
  Downloading awscli-1.10.43-py2.py3-none-any.whl (969kB)
    100% |████████████████████████████████| 972kB 1.9MB/s 
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 1006, in check_if_exists
    self.satisfied_by = pkg_resources.get_distribution(str(no_marker))
  File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 535, in get_distribution
    dist = get_provider(dist)
  File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 415, in get_provider
    return working_set.find(moduleOrReq) or require(str(moduleOrReq))[0]
  File "/usr/share/python-wheels/pkg_resources-0.0.0-py2.py3-none-any.whl/pkg_resources/__init__.py", line 695, in find
    raise VersionConflict(dist, req)
pkg_resources.VersionConflict: (colorama 0.3.7 (/usr/lib/python3/dist-packages), Requirement.parse('colorama<=0.3.3,>=0.2.5'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 209, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 328, in run
    wb.build(autobuilding=True)
  File "/usr/lib/python3/dist-packages/pip/wheel.py", line 748, in build
    self.requirement_set.prepare_files(self.finder)
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 360, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 448, in _prepare_file
    req_to_install, finder)
  File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 387, in _check_skip_installed
    req_to_install.check_if_exists()
  File "/usr/lib/python3/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.
root@jeff-desktop:~# 

I looked at colorama, it's up to 0.3.7 and it's kinda frustrating that this should crash over such a minor feature. I got version 0.3.3 from https://pypi.python.org/pypi/colorama/0.3.3, untar'd it, ran
python setup.py install. Then I ran pip install awscli and that worked properly.

[JordonPhillips]

Does downgrading via pip not work? You could also try installing via the bundled installer.

Either way, I think this means we need to either accept the breaking change from .3.3+ or find a way to fix the issue.

[jeffsilverm]

Jordon,

I didn't think of downgrading via pip, so I don't know the answer. Is that
an important enough question that I should try the experiment?

My thinking at the moment is that however I downgraded colorama, that was
the work around to the problem. Yes, in retrospect I probably did do it
the hard way, but it's done now.

I don't have a lot of expertise in some of the finer things you can do with
pip. If you want me to, I can restore colorama to its original state,
verify that the problem returns, then use pip to downgrade, and verify that
that solves the issue. That does seem like a lot of work. But I defer to
your expertise - if you want me to do it, then I will do it.

Jeff

On Wed, Jun 29, 2016 at 10:00 AM, Jordon Phillips notifications@github.com
wrote:

Does downgrading via pip not work? You could also try installing via the
bundled installer.

Either way, I think this means we need to either accept the breaking
change from .3.3+ or find a way to fix the issue.

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