[Python-Dev] [compatibility-sig] making sure importlib.machinery.SourceLoader doesn't throw an exception if bytecode is not supported by a VM

[Brett Cannon]

I would like to have importlib just work out of the box for all VMs in 3.3
instead of requiring a minor patch in order to not throw an exception when
loading from source and there is no bytecode. The relevant code for this
discussion can be seen at
http://hg.python.org/cpython/file/c2910971eb86/Lib/importlib/_bootstrap.py#l691
 .

First question is what are all the VMs doing for imp.cache_from_source()?
Are you implementing it like CPython, or are you returning None? And if you
implemented it, what does marshal.loads() do? Right now cache_from_source()
is implemented in importlib itself, but we can either provide a flag to
control what it does or in your setup code for import you can override the
function with ``lambda _, __=None: None``.

Second question, what do you set sys.dont_write_bytecode to?

The answers to those questions will dictate if there is anything to
actually discuss. =)
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