issues: 212501628

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
212501628 MDU6SXNzdWUyMTI1MDE2Mjg= 1300 git version label yields version in violation of PEP 440 500246 closed 0     2 2017-03-07T17:23:00Z 2017-12-15T07:26:24Z 2017-12-15T07:26:24Z CONTRIBUTOR      

When an xarray installation does not match a released version ,it has a version number like 0.9.1-28-g769f120.

This violates PEP 440, which leads to multiple problems:

  • pip install --update will revert xarray back to 0.9.1, because it does not recognise that 0.9.1-28-g769f120 > 0.9.1
  • packages with an xarray dependencies will be considered not satisfied. Running a script through setuptools load_entry_point fails with pkg_resources.ContextualVersionConflict: (xarray 0.9.1-28-g769f120 (/dev/shm/gerrit/venv/stable-3.5/lib/python3.5/site-packages), Requirement.parse('xarray>=0.8')

Instead, the version number above should be written as 0.9.1+r10345 or so, which would satisfy PEP 440 and not cause problems with pip or setuptools.

 
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