Python-guidelines.md

@@ -21,5 +21,8 @@ Tools to check and/or fix style
   follows PEP257.
 - [isort](https://pycqa.github.io/isort/): sort imports alphabetically and 
   automatically separated into sections and by type.
+- in Emacs:
+  - [elpy](https://github.com/jorgenschaefer/elpy/) can run flake8 or black checks automatically (or manually)
+  - [flycheck](https://www.flycheck.org/en/latest/) can warn you, "on the fly", about style issues in Python 
 
 Other tools: https://realpython.com/python-code-quality/
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