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20.15.0 - 'PythonInfo' object has no attribute 'version_nodot' (Jenkins / tox / py35)

See original GitHub issue

Suddenly getting the below with the latest virtualenv 20.15.0 This is on a work jenkins build so I am unable to provide any more details / logs than below. Hopefully its enough.

unittest-py35 uses C:\Python35\python.exe
unittest-py35 start: getenv C:\jenkins\workspace\omation_report_generators_master@2\.tox\unittest-py35
unittest-py35 cannot reuse: no previous config C:\jenkins\workspace\omation_report_generators_master@2\.tox\unittest-py35\.tox-config1
unittest-py35 create: C:\jenkins\workspace\omation_report_generators_master@2\.tox\unittest-py35
[49544] C:\jenkins\workspace\omation_report_generators_master@2\.tox$ 'C:\jenkins\workspace\omation_report_generators_master@2\venv\Scripts\python.exe' -m virtualenv --no-download --python 'C:\Python35\python.exe' unittest-py35
AttributeError: 'PythonInfo' object has no attribute 'version_nodot'
ERROR: invocation failed (exit code 1)
ERROR: InvocationError for command 'C:\jenkins\workspace\omation_report_generators_master@2\venv\Scripts\python.exe' -m virtualenv --no-download --python 'C:\Python35\python.exe' unittest-py35 (exited with code 1)
unittest-py35 finish: getenv C:\jenkins\workspace\omation_report_generators_master@2\.tox\unittest-py35 after 9.27 seconds
___________________________________ summary ___________________________________
ERROR:   unittest-py35: InvocationError for command 'C:\jenkins\workspace\omation_report_generators_master@2\venv\Scripts\python.exe' -m virtualenv --no-download --python 'C:\Python35\python.exe' unittest-py35 (exited with code 1)
cleanup C:\jenkins\workspace\omation_report_generators_master@2\.tox\.tmp\package\1\report_generators-1.0.42+4c3f2cb-py2.py3-none-any.whl

The py27 and py37 steps still work fine. So appears to be just py35 Maybe TOX needs to be updated to support?