The compileall module's command line interface has a -q (quiet) flag which suppresses most of the output, but it still prints error messages. I'd like an entirely silent mode with no output.

My use case is byte-compiling Python files as part of a graphical installer. I do this by running:

py -${PY_QUALIFIER} -m compileall -q "$INSTDIR\pkgs"

I'd like to be able to use pyw so a terminal doesn't pop up, but if I do that, it exits early. I think this is due to the issue with stdout/stderr buffers filling up on pythonw.