Ruby and Python's standard implementations make use of a Global Interpreter Lock. Justin James explains the major advantages and downsides of the GIL mechanism.

There’s more than one way to thread (or not to thread) a Python program. We point you to several threading resources, a fast new static type checker from Astral, a monkey patch for Pandas that ...

A Python program that uses threading is typically a good candidate for using async. Threads in Python are cooperative; they yield to one another as needed. Async tasks in Python work the same way.