[Distutils] latest setuptools appears to require six in a breaking way

[Matthias Bussonnier]

AFAICT this is not really an issue as this is on the release notes:

https://setuptools.readthedocs.io/en/latest/history.html#v34-0-0

You need to upgrade pip  (cf 3rd paragraph):

> #581: Instead of vendoring the growing list of dependencies that Setuptools requires to function, Setuptools now requires these dependencies just like any other project. Unlike other projects, however, Setuptools cannot rely on setup_requires to demand the dependencies it needs to install because its own machinery would be necessary to pull those dependencies if not present (a bootstrapping problem). As a result, Setuptools no longer supports self upgrade or installation in the general case. Instead, users are directed to use pip to install and upgrade using the wheel distributions of setuptools.

> Users are welcome to contrive other means to install or upgrade Setuptools using other means, such as pre-installing the Setuptools dependencies with pip or a bespoke bootstrap tool, but such usage is not recommended and is not supported.

 >As discovered in #940, not all versions of pip will successfully
install Setuptools from its pre-built wheel. If you encounter issues
with “No module named six” or “No module named packaging”, especially
following a line “Running setup.py egg_info for package setuptools”,
then your pip is not new enough.

> There’s an additional issue in pip where setuptools is upgraded concurrently with other source packages, described in pip #4253. The proposed workaround is to always upgrade Setuptools first prior to upgrading other packages that would upgrade Setuptools.

-- 
M

On Wed, Jan 25, 2017 at 6:46 AM, Robin Becker <robin at reportlab.com> wrote:
>
> On 25/01/2017 10:41, Chris Withers wrote:
>>
>> Hi All,
>>
>> Anyone else seen this?
>>
>> |File
>>
>> "/home/travis/virtualenv/python2.6.9/lib/python2.6/site-packages/setuptools/__init__.py",
>> line 10, in <module> from six.moves import filter, map ImportError: No
>> module
>> named six.moves|
>>
> My colleague just came across this when creating a new venv.
>
> We then installed six, but our setup then went on to complain about
> packaging and then finally appdirs before it went through.
>
> Each time the fix was to manually install the thing that pip complained
> about.
>
>
>>
>> Started happening in my nightly builds on travis after the 34.0.2 release
>> of
>> setuptools. I've filed an issue here since I suspect it isn't just me:
>>
>> https://github.com/pypa/setuptools/issues/945
>>
>> cheers,
>>
>> Chris
>>
>>
>>
>> _______________________________________________
>> Distutils-SIG maillist  -  Distutils-SIG at python.org
>> https://mail.python.org/mailman/listinfo/distutils-sig
>>
>
>
> --
> Robin Becker
> _______________________________________________
> Distutils-SIG maillist  -  Distutils-SIG at python.org
> https://mail.python.org/mailman/listinfo/distutils-sig