[issue14153] Expose os.device_encoding() at the C level

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I don't seen any refcounting problem here, but your patch is buggy.
Before patch:

>>> os.device_encoding(0)
'UTF-8'

After patch:

>>> os.device_encoding(0) is None
True

Interestingly, it seems there is no test for os.device_encoding. Perhaps add one to test_os?

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<http://bugs.python.org/issue14153>
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