Adding info regarding python quality checking

README.md

@@ -96,7 +96,7 @@ If you need to do some global scaling / offset of all zooms in HTML (if for exam
 
 ## Setting up quality checking for JS
 
- Regarding JS, quality checking is done using [eslint](https://eslint.org/).
+Regarding JS, quality checking is done using [eslint](https://eslint.org/).
 
 The configuration file is `eslint/eslintrc.json`.
 
@@ -110,6 +110,23 @@ To do so, assuming you are using linux, after installing docker, you can run fro
 
 You can now open `eslint_report.html` to see the result.
 
+## Setting up quality checking for Python
+
+Regarding Python, quality checking is done using [prospector](https://prospector.landscape.io/en/master/) using [mypy](https://mypy.readthedocs.io/en/stable/) as an additional checker.
+Auto-formating is done using [Black](https://pypi.org/project/black/)
+
+Dependencies are managed not using `pip` but [`pipenv`](https://pipenv.pypa.io/en/latest/).
+
+To setup prospector, you need to run:
+
++ Only once, in melpomene's root folder:
+    + Install pipenv: `pip install pipenv`
+    + Install melpomene's root folder: `pipenv install --dev`
++ Every time to run the quality checking:
+    + `pipenv shell`
+    + `prospector -s veryhigh -w mypy --max-line-length 88 .`
+    + `black .`
+
 # Credits
 
 Most examples and the documentation of Melpomene uses illustrations from David "Deevad" Revoy's "Pepper & Carrot" webcomic, which is published under CC-BY 4.0. Full licence [here](https://www.peppercarrot.com/en/license/index.html).