Suppressing output of module calling outside library

Question

I have an annoying problem when using machine learning library PyML. PyML uses libsvm to train the SVM classifier. The problem is that libsvm outputs some text to standard o

Answer 1

I had a similar problem with portaudio/PyAudio initialization. I started with Reid's answer, which worked. Although I needed to redirect stderr instead. So, here is an updated, cross-platform version that redirects both:

import sys, os

# hide diagnostic output
with open(os.devnull, 'w') as devnull:
    # suppress stdout
    orig_stdout_fno = os.dup(sys.stdout.fileno())
    os.dup2(devnull.fileno(), 1)
    # suppress stderr
    orig_stderr_fno = os.dup(sys.stderr.fileno())
    os.dup2(devnull.fileno(), 2)

    print('*** stdout should be hidden!  ****')
    print('*** stderr should be too!  ****',
          file=sys.stderr)

    os.dup2(orig_stdout_fno, 1)  # restore stdout
    os.dup2(orig_stderr_fno, 2)  # restore stderr

print('done.')

Should be easy to comment out a part you don't need.