python -m darker doesn't work

[akaihola]

The README.rst file states:

Alternatively, you can invoke the module directly through the python executable, which may be preferable depending on your setup. Use python -m darker instead of darker in that case.

This is actually not true:

$ python -m darker --help
/tmp/darker-test-venv/bin/python: No module named darker

This should either be fixed or removed from documentation.

[Mystic-Mirage]

Works for me

$ python -m darker --help
usage: __main__.py [-h] [--diff] [-i] [-c PATH] [-v] [-q] [--version] [-S]
                   [-l LINE_LENGTH]
                   [src [src ...]]

Re-format Python source files by using
- `isort` to sort Python import definitions alphabetically within logical
   sections
- `black` to re-format code changed since the last Git commit

positional arguments:
  src

optional arguments:
  -h, --help            show this help message and exit
  --diff                Don't write the files back, just output a diff for
                        each file on stdout
  -i, --isort           Also sort imports using the `isort` package
  -c PATH, --config PATH
                        Ask `black` and `isort` to read configuration from
                        PATH.
  -v, --verbose         Show steps taken and summarize modifications
  -q, --quiet           Reduce amount of output
  --version             Show the version of `darker`
  -S, --skip-string-normalization
                        Don't normalize string quotes or prefixes
  -l LINE_LENGTH, --line-length LINE_LENGTH
                        How many characters per line to allow [default: 88]

[CorreyL]

(venv) λ pip install darker
Collecting darker
  Downloading https://files.pythonhosted.org/packages/09/b6/3ba825126169f2ae860a6cb19b05db23b5304f801f0ebadfceadbc0aa891/darker-1.0.0-py3-none-any.whl
Collecting black (from darker)
  Using cached https://files.pythonhosted.org/packages/fd/bb/ad34bbc93d1bea3de086d7c59e528d4a503ac8fe318bd1fa48605584c3d2/black-19.10b0-py36-none-any.whl
Collecting pathspec<1,>=0.6 (from black->darker)
  Using cached https://files.pythonhosted.org/packages/5d/d0/887c58853bd4b6ffc7aa9cdba4fc57d7b979b45888a6bd47e4568e1cf868/pathspec-0.8.0-py2.py3-none-any.whl
Collecting typed-ast>=1.4.0 (from black->darker)
  Using cached https://files.pythonhosted.org/packages/2a/e3/ec45191e05718c0b686fbedf95620c650f185fa92dfc3b12ee9db90e0b4c/typed_ast-1.4.1-cp38-cp38-win_amd64.whl
Collecting attrs>=18.1.0 (from black->darker)
  Using cached https://files.pythonhosted.org/packages/a2/db/4313ab3be961f7a763066401fb77f7748373b6094076ae2bda2806988af6/attrs-19.3.0-py2.py3-none-any.whl
Collecting appdirs (from black->darker)
  Using cached https://files.pythonhosted.org/packages/3b/00/2344469e2084fb287c2e0b57b72910309874c3245463acd6cf5e3db69324/appdirs-1.4.4-py2.py3-none-any.whl
Collecting regex (from black->darker)
  Downloading https://files.pythonhosted.org/packages/8a/09/97545f6d0695243cba094bb7a4f9c86483acea1b89ab8686db30d1910b47/regex-2020.7.14-cp38-cp38-win_amd64.whl (264kB)
     |████████████████████████████████| 266kB 652kB/s
Collecting toml>=0.9.4 (from black->darker)
  Using cached https://files.pythonhosted.org/packages/9f/e1/1b40b80f2e1663a6b9f497123c11d7d988c0919abbf3c3f2688e448c5363/toml-0.10.1-py2.py3-none-any.whl
Collecting click>=6.5 (from black->darker)
  Using cached https://files.pythonhosted.org/packages/d2/3d/fa76db83bf75c4f8d338c2fd15c8d33fdd7ad23a9b5e57eb6c5de26b430e/click-7.1.2-py2.py3-none-any.whl
Installing collected packages: pathspec, typed-ast, attrs, appdirs, regex, toml, click, black, darker
Successfully installed appdirs-1.4.4 attrs-19.3.0 black-19.10b0 click-7.1.2 darker-1.0.0 pathspec-0.8.0 regex-2020.7.14 toml-0.10.1 typed-ast-1.4.1
WARNING: You are using pip version 19.2.3, however version 20.1.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

(venv) λ python -m darker --help
usage: __main__.py [-h] [--diff] [-i] [-c PATH] [-v] [-q] [--version] [-S] [-l LINE_LENGTH] [src [src ...]]

Re-format Python source files by using
- `isort` to sort Python import definitions alphabetically within logical sections
- `black` to re-format code changed since the last Git commit

Please run `pip install 'darker[isort]'` to enable sorting of import definitions

positional arguments:
  src

optional arguments:
  -h, --help            show this help message and exit
  --diff                Don't write the files back, just output a diff for each file on stdout
  -i, --isort           Also sort imports using the `isort` package. Please run `pip install 'darker[isort]'` to
                        enable usage of this option.
  -c PATH, --config PATH
                        Ask `black` and `isort` to read configuration from PATH.
  -v, --verbose         Show steps taken and summarize modifications
  -q, --quiet           Reduce amount of output
  --version             Show the version of `darker`
  -S, --skip-string-normalization
                        Don't normalize string quotes or prefixes
  -l LINE_LENGTH, --line-length LINE_LENGTH
                        How many characters per line to allow [default: 88]
(venv) λ python --version
Python 3.8.3

For what it's worth.

[akaihola]

Indeed now works for me, too. I have no idea what I did differently back when I got that error.