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I've thought about this in the past, but never really pursued it due to the question of what to do with the __main__ namespace.
There are three options here:
1. Use runpy.run_module to run the module in a fresh __main__ namespace
2. Use runpy.run_module to run the module under its own name
3. Use runpy._run_module_as_main to run the module in the real __main__ namespace
Option 3 is probably a bad idea (due to the risk of clobbering globals from pdb/trace/profile/doctest/etc) but failing to do it that way creates a difference between the way the actual -m switch works and what these modules will be doing.
That said, I haven't looked closely at what these modules do for ordinary scripts, where much the same problem will already arise. If option 1 is adequate for this purpose, then it shouldn't be that hard to add - it's just that I've never done the investigation to see if it *would* be adequate.