Python 3.9’s PEG-based parser removed these barriers, which long-term could lead to more elegant syntax — our first example of this change is the new parenthesized context managers.

Tutorials for learning Python lists can be found at python.org (data structures) or tutorialspoint. Difference between tuples and lists: Tuples have no methods, which means that you can't add, remove, ...

Long in development, the new major release of the Python-to-C compiler sheds legacy Python support and readies Cython developers for big changes in Python.