Stefan Behnel <sco...@users.sourceforge.net> added the comment:

I would definitely appreciate having a well-defined set of "required
tests" that Cython should pass for compliance.

However, something like sys.vm won't easily work for Cython: it runs
within the CPython VM but only after converting the Python code to C.
Emulating platform.python_implementation() to make it return "Cython"
does not sound correct.

You can currently detect Cython compilation by doing this:

    import cython
    print cython.compiled

Obviously, the import will fail when running as Python code without
having Cython installed.

However, in Cython, you would often get a compile time error in cases
where implementation details apply, so checking for implementation
details programmatically may not work at all.

----------
nosy: +scoder

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<http://bugs.python.org/issue4242>
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