arlpy outputs debug messages to stdout

[vlaskine]

Various arlpy methods output debug messages to stdout. It makes it impossible to use arlpy in the standard Linux pipeline mode like cat some-input.csv | some-script-using-arlpy | process-output ... It is quite a limitation and inconvenience. The fix is really straightforward.

The places I tripped over are (there may be other cases):

• using print( something ): should be print( something, file=sys.stderr ) or logging.info(...) or alike.
• uwapm.py: _proc.call(['bellhop.exe'] + list(args), stderr=_proc.STDOUT) should be stderr=_proc.STDERR

[mchitre]

Fair enough. Would you be willing to PR the changes needed @vlaskine?

[vlaskine]

Thanks, I just created a pull request: https://github.com/org-arl/arlpy/pull/80

It fixes only uwapm, because that's the only part of uwapy that we are currently using and thus that's the only one that I could test.

[mchitre]

Fixed by #80