The logging module has a bug that tries to call `flush' on a closed 
file handle (sys.std[out|err] to be specific). This bug was introduced 
by ConsoleHandler as defined in http://code.activestate.com/
recipes/576819/

The fix is simple: change definition of StreamHandler.flush in logging/
__init__.py to:

  def flush(self):
      if self.stream and hasattr(self.stream, 'flush') and not 
self.stream.closed:
          logging.StreamHandler.flush()