[Bug 1570587] Re: [FFe] Please update to bugfix release 20.7

[Donald Stufft]

That is correct. For awhile now Python has had an adhoc concept of
environment markers, but there wasn't standard for what they were and
what they supported so each implementation was slightly different (this
is a common theme with Python packaging). We attempted to standardize
this in PEP 508 which was largely compatible with the primary
implementations but wasn't 100% compatible. setuptools 20.2 switched to
the new parser, which *only* supported PEP 508 markers and not any of
the older markers, which meant that anything that relied on one of the
cases that PEP 508 no longer supported was broken. The fixes since then
restore compatability with those, and continue to keep those old
projects installable. The regressions in 20.2 were fairly major.

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Title:
  [FFe] Please update to bugfix release 20.7

Status in python-setuptools package in Ubuntu:
  New

Bug description:
  In the upstream version v20.2 setuptools switched implementations of
  parser libraries. This is an internal implementation detail, however
  the new parser library did not correctly handle several edge cases
  which caused regressions preventing certain packages from installing
  or, in some cases, even running. These issues have been fixed upstream
  by versions v20.6.6 and v20.6.8. The changelog delta between what
  Ubuntu currently has an v20.7 looks like:

  v20.7.0
  -------

  * Refactored extra enviroment marker processing
    in WorkingSet.
  * Issue #533: Fixed intermittent test failures.
  * Issue #536: In msvc9_support, trap additional exceptions
    that might occur when importing
    ``distutils.msvc9compiler`` in mingw environments.
  * Issue #537: Provide better context when package
    metadata fails to decode in UTF-8.

  v20.6.8
  -------

  * Issue #523: Restored support for environment markers,
    now honoring 'extra' environment markers.

  v20.6.7
  -------

  * Issue #523: Disabled support for environment markers
    introduced in v20.5.

  v20.6.6
  -------

  * Issue #503: Restore support for PEP 345 environment
    markers by updating to Packaging 16.6.

  v20.6.0
  -------

  * New release process that relies on
    `bumpversion <https://github.com/peritus/bumpversion>`_
    and Travis CI for continuous deployment.
  * Project versioning semantics now follow
    `semver <https://semver.org>`_ precisely.
    The 'v' prefix on version numbers now also allows
    version numbers to be referenced in the changelog,
    e.g. https://pythonhosted.org/setuptools/history.html#v20-6-0.

  20.5
  ----

  * BB Pull Request #185: Add support for environment markers
    in requirements in install_requires, setup_requires,
    tests_require as well as adding a test for the existing
    extra_requires machinery.

  20.4
  ----

  * Issue #422: Moved hosting to
    `Github <https://github.com/pypa/setuptools>`_
    from `Bitbucket <https://bitbucket.org/pypa/setuptools>`_.
    Issues have been migrated, though all issues and comments
    are attributed to bb-migration. So if you have a particular
    issue or issues to which you've been subscribed, you will
    want to "watch" the equivalent issue in Github.
    The Bitbucket project will be retained for the indefinite
    future, but Github now hosts the canonical project repository.

  
  As you can see, v20.4 simply adjusted documentation and some release scripts to deal with the migration from Mercurial+Bitbucket to Git+Github and should have little bearing on the actual project or have much potential for regression. The next version, v20.5 did add a new feature, but was later removed in v20.6.7. v20.6.0 is another release which largely just changed processed and documentation without any major code changes. v20.6.1-5 are nonexistent, v20.6.6 is a change we want, v20.6.8 is a change we want, and v20.7 is some minor bugfixes and a tiny bit of refactoring.

  You can see a diff here: https://launchpadlibrarian.net/253841863
  /python-setuptools_20.3.1-1_20.7.0-1.diff.gz though it is deceptively
  larger than it actually is due to the rename of CHANGES.txt ->
  CHANGES.rst and some shuffling around of URLs and such in the
  documentation.

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