[Python-Dev] Help needed: problems getting the expected default encoding for embedded IO config test (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Thu Oct 17 18:25:26 CEST 2013

http://bugs.python.org/issue16129 added a Py_SetStandardStreamEncoding API to allow embedding applications like Blender to explicitly configure the encoding and error handler for the standard IO streams.

However, the test case didn't get along with the buildbots, and I'm struggling to figure out why.

To deal with the possible variation in the default encoding across systems, I use sys.std*.encoding to work out the expected default encoding for the streams.

However, as you can see in an example like http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.0%203.x/builds/579/steps/test/logs/stdio, this is failing, with the encoding in the expected data being None, while the values from the subprocess actually look right. In the "re-run at the end" case, it all works fine, so it doesn't appear to be anything inherently wrong with the affected systems.

The test pass without any problems on my own system (otherwise I wouldn't have checked it in). Running the full test suite the same way the buildbots do also worked fine locally.

I've marked the offending test as skipped for now (and reopened the tracker issue), and will look into it more tomorrow. but figured I'd mention it here in case anyone had any good suggestions (the next thing on my to try list is running with the hash seed from one of the failing buildbots, in case it's a cross-test interference problem).

Cheers, Nick.

-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia

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