Redirect stderr

redirect_stderr.py

import contextlib

@contextlib.contextmanager
def redirect_stderr():
    '''Redirect stderr across processes temporarily.'''

    stderr = None
    try:
        stderr = os.dup(sys.stderr.fileno())
        with open(os.devnull, 'w') as devnull:
            os.dup2(devnull.fileno(), sys.stderr.fileno())
            yield
    finally:
        if stderr is not None:
            os.dup2(stderr, sys.stderr.fileno())