To run black on the entire file

File -> Settings
-> Tools -> External Tools -> click on + sign
-> Name: Black
   Description: Black in pycharm configuration
   Program: C:\ProgramData\Continuum\Anaconda\envs\[ENV_NAME]\Scripts\black.exe
   Arguments: $FilePath$
   Working directory: $ProjectFileDir$

To run black on selected text

File -> Settings
-> Tools -> External Tools -> click on + sign
-> Name: Black Selected
   Description: run black on selected text
   Program: "C:\Program Files\Git\bin\bash.exe"
   Arguments: --login H:\work\myrepos\rutils\python3\black_on_selected.sh C:\ProgramData\Continuum\Anaconda\envs\ro_udw_env\Scripts\black.exe $FilePath$ $SelectionStartLine$ $SelectionEndLine$
   Working directory: $ProjectFileDir$

Restart pycharm after adding the external tools.

To format code

Select code of interest
-> Tools -> External Tools -> Black Selected

See also :-

• black_on_selected.sh (github.com/KamarajuKusumanchi) - simpler implementation; works with GNU sed. Tested it on Windows 10 + git bash + GNU sed 4.7.
• https://godatadriven.com/blog/partial-python-code-formatting-with-black-pycharm/ - well explained; His script is a bit complex and the sed commands are mac specific.
• https://www.jetbrains.com/help/pycharm/configuring-third-party-tools.html

pass --skip-string-normalization on the command line.

Ref:-

• https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#strings - this option is meant as an adoption helper, avoid using it for new projects.

• https://black.now.sh/ - Black Playground; To try black online
• code repo - https://github.com/psf/black