[$] Making multiple interpreters available to Python code

It has long been possible to run multiple Python interpreters in the sameprocess - via the C API, but not within the language itself.Eric Snow has been working to make this abilityavailable in the language for many years.Now, Snow has publishedPEP 734 ("Multiple Interpretersin the Stdlib"), the latest work in hisquest, andsubmittedit to the Python steering council for a decision.If the PEP is approved, users will havean additional option for writing performant parallel Python code.