Shane Hathaway added the comment: Thanks for the analysis. I have already started a pull request to fix this in Supervisor, but I also thought this change to Python might be gratuitous and accidental. It seems like open('/dev/stdout', 'a') ought to work the same as Python 2. If not, the Python documentation should warn people that using 'a' with character devices and FIFOs will cause an OSError.
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