SimPy 2.1 is a great refactoring of SimPy 2.0. It has been primarily developed by Ontje Lünsdorf, with key inputs by Stefan Scherfke. SimPy now offers much better capabilities for writing debugger code. It is also easier to maintain, as the code base has been significantly reduced.
Thanks, guys, for this great job! You have become a major force in SimPy’s evolution.
The many contributions of the SimPy user and developer communities are of course also gratefully acknowledged.