[issue19946] Have multiprocessing raise ImportError when spawning a process that can't find the "main" module

[Olivier Grisel]

Olivier Grisel added the comment:

> The semantics are not going to change in python 3.4 and will just stay as they were in Python 3.3.

Well the semantics do change: in Python 3.3 the spawn and forkserver modes did not exist at all. The "spawn" mode existed but only implicitly and only under Windows.

So Python 3.4 is introducing a new feature for POSIX systems that will only work in the rare cases where the Python program is launched by a ".py" ending script.

Would running the `imp.load_source` trick only if `sys.platform != "win32"` be a viable way to preserve the semantics of Python 3.3 under the windows while not introducing a partially broken feature in Python 3.4?

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<http://bugs.python.org/issue19946>
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