Message 368994 - Python tracker

Title clarified.  Leaving subinterpreters aside, only one instance, AFAIK, is true for stdlib and python modules unless imported with different names, as can happen with main module (which is a nuisance if not a bug).  So only once per interpreter seems like a bugfix.  Only once per process, if once per interpreter otherwise becomes normal, seems like an enhancement, even if a necessary option.