Fix NoxColoredFormatter.format

[stsewd]

This errors when running nox -v.
That method is making use of _simple_fmt,
but isn't defined in the class.
I used the same value as NoxFormatter

[crwilcox]

@stsewd I ran nox -v with HEAD and with this branch, but I am not sure I am seeing what isn't working that is now?

pip install -e .
nox -v -s tests-3.9

[stsewd]

@crwilcox with the current version you'll get an exception

$ nox -v -s tests-3.9
nox > Running session tests-3.9
nox > Creating virtual environment (virtualenv) using python3.9 in .nox/tests-3-9
--- Logging error ---
Traceback (most recent call last):
  File "/home/stsewd/.pyenv/versions/3.9.1/lib/python3.9/logging/__init__.py", line 1079, in emit
    msg = self.format(record)
  File "/home/stsewd/.pyenv/versions/3.9.1/lib/python3.9/logging/__init__.py", line 923, in format
    return fmt.format(record)
  File "/home/stsewd/github/nox/nox/logger.py", line 69, in format
    return self._simple_fmt.format(record)
AttributeError: 'NoxColoredFormatter' object has no attribute '_simple_fmt'
Call stack:
  File "/home/stsewd/.pyenv/versions/nox/bin/nox", line 33, in <module>
    sys.exit(load_entry_point('nox', 'console_scripts', 'nox')())
  File "/home/stsewd/github/nox/nox/__main__.py", line 49, in main
    exit_code = workflow.execute(
  File "/home/stsewd/github/nox/nox/workflow.py", line 49, in execute
    return_value = function_(*args, global_config=global_config)
  File "/home/stsewd/github/nox/nox/tasks.py", line 244, in run_manifest
    result = session.execute()
  File "/home/stsewd/github/nox/nox/sessions.py", line 547, in execute
    self._create_venv()
  File "/home/stsewd/github/nox/nox/sessions.py", line 534, in _create_venv
    self.venv.create()
  File "/home/stsewd/github/nox/nox/virtualenv.py", line 404, in create
    nox.command.run(cmd, silent=True, log=False)
  File "/home/stsewd/github/nox/nox/command.py", line 128, in run
    logger.output(output)
  File "/home/stsewd/github/nox/nox/logger.py", line 87, in output
    self._log(OUTPUT, msg, args, **kwargs)
Message: 'created virtual environment CPython3.9.1.final.0-64 in 85ms\n  creator CPython3Posix(dest=/home/stsewd/github/nox/.nox/tests-3-9, clear=False, no_vcs_ignore=False, global=False)\n  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/stsewd/.local/share/virtualenv)\n    added seed packages: pip==20.3.1, setuptools==51.0.0, wheel==0.36.1\n  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator\n'
Arguments: ()
nox > python -m pip install -r requirements-test.txt

If you can't replicate that, not sure, maybe another nox is in the path? python nox/__main__.py -v

[crwilcox]

@stsewd sure enough, the pyenv shim of nox was winning out :)

created virtual environment CPython3.9.0.final.0-64 in 396ms
  creator CPython3Posix(dest=/home/crwilcox/workspace/nox/.nox/tests-3-9, clear=False, no_vcs_ignore=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/crwilcox/.local/share/virtualenv)
    added seed packages: pip==20.2.4, setuptools==50.3.2, wheel==0.35.1
  activators BashActivator,CShellActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator