An important thing to note that is a bit buried in this text: Python bytecode changes in every version, sometimes just a little, sometimes a lot. So Python 3.1

An important thing to note that is a bit buried in this text: Python bytecode changes in every version, sometimes just a little, sometimes a lot. So Python 3.10 has difference in the bytecode instruction set from 3.9, and 3.11 will have differences from 3.10.