[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2956: AppVeyor Windows CI builds are failing

[Tahoe-LAFS]

#2956: AppVeyor Windows CI builds are failing
--------------------------------+---------------------------
 Reporter:  exarkun             |          Owner:
     Type:  defect              |         Status:  new
 Priority:  supercritical       |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  1.12.1
 Keywords:                      |  Launchpad Bug:
--------------------------------+---------------------------
 {{{
 %PYTHON%\Scripts\tox.exe -e py
 Traceback (most recent call last):
   File "c:\python27\lib\runpy.py", line 174, in _run_module_as_main
     "__main__", fname, loader, pkg_name)
   File "c:\python27\lib\runpy.py", line 72, in _run_code
     exec code in run_globals
   File "C:\Python27\Scripts\tox.exe\__main__.py", line 9, in <module>
   File "c:\python27\lib\site-packages\tox\session.py", line 47, in cmdline
     main(args)
   File "c:\python27\lib\site-packages\tox\session.py", line 52, in main
     config = prepare(args)
   File "c:\python27\lib\site-packages\tox\session.py", line 34, in prepare
     config = parseconfig(args)
   File "c:\python27\lib\site-packages\tox\config\__init__.py", line 238,
 in parseconfig
     ParseIni(config, config_file, content)
   File "c:\python27\lib\site-packages\tox\config\__init__.py", line 1070,
 in __init__
     config.envconfigs[name] = self.make_envconfig(name, section,
 reader._subs, config)
   File "c:\python27\lib\site-packages\tox\config\__init__.py", line 1141,
 in make_envconfig
     res = env_attr.postprocess(testenv_config=tc, value=res)
   File "c:\python27\lib\site-packages\tox\config\__init__.py", line 568,
 in basepython_default
     implied_version = tox.PYTHON.PY_FACTORS_RE.match(factor).group(2)
 AttributeError: 'NoneType' object has no attribute 'group'
 }}}

 https://ci.appveyor.com/project/tahoe-lafs/tahoe-
 lafs/builds/21835427/job/ka3oyne1svibilar

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2956>
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