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> I also think that [there] is still too much C code as it makes the whole thing somewhat brittle
> to any refactoring of importlib. I am seriously thinking of tossing the C code I have written and
> writing in C only the bare minimum needed to get to the sys.modules check, and otherwise punting
> to importlib for everything else in a single call or two.
A few thoughts from my outsider viewpoint:
1) I think the point of importlib is to have maintainable code (i.e. the anti-import.c <wink>), so writing only the minimum code in C makes sense.
2) Speed is a concern, especially with sysconfig in 3.3 slowing startup, but a secondary concern.
3) Maybe some parts can be written in C later, after profiling, and then override Python functions (à la "from _heapq import *", if that’s possible at all for importlib).
4) When is PyPy going to be the reference implementation again? Then we’ll have no speed issues—ha ha only serious.
5) importlib rocks hard.