Python
General
Jypyter Notebook
Welcome to Python
Learn Python
Automate the boring stuff
Data wrangling with Python: tips and tools to make your life easier
Making games with Python
Real Python Tutorials & Documentation
PyMarc
PyMarc library on GitHub
Other
Pyodide—an experimental project that “gives you a full, standard Python interpreter that runs entirely in the browser, with full access to the browser’s Web APIs.”
Python Virtual Environments: A Primer