Make python bindings article partially work on win

Python-menus-toolbars-sample-app

Create sentiment_analyzer.py

Bump black from 19.10b0 to 20.8b1

Merge branch 'dependabot/pip/black-20.8b1' of github.com:realpython/materials into dependabot/pip/black-20.8b1

Bumps [black](https://github.com/psf/black) from 19.10b0 to 20.8b1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/master/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)
Signed-off-by: Ndependabot[bot] <support@github.com>

Bump flake8 from 3.8.2 to 3.8.4

Bumps [flake8](https://gitlab.com/pycqa/flake8) from 3.8.2 to 3.8.4.
- [Release notes](https://gitlab.com/pycqa/flake8/tags)
- [Commits](https://gitlab.com/pycqa/flake8/compare/3.8.2...3.8.4)
Signed-off-by: Ndependabot[bot] <support@github.com>

Bumps [black](https://github.com/psf/black) from 19.10b0 to 20.8b1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/master/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)
Signed-off-by: Ndependabot[bot] <support@github.com>

Update Dependabot config file

Fix the linter error