Any way to suppress stdout?

[jjm0022]

I was wondering if there was any way to prevent all of the output from the library when the server is starting up? I know there's ways I can suppress it myself but I was wondering if there was a way I could do it through the library.

[brendano]

Yeah, we need to add a flag to do that (or perhaps, make it quiet by default and have a verbose flag). Right now there's no way.

It does print those messages to standard error, not standard output, which is hopefully a little helpful.

I can't remember though -- does the corenlp java system print to stdout? my guess is there's nothing we can do about that.

On Wed, Mar 8, 2017 at 12:45 PM, J.J. Miller [email protected] wrote:

I was wondering if there was any way to prevent all of the output from the library when the server is starting up? I know there's ways I can suppress it myself but I was wondering if there was a way I could do it through the library.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/brendano/stanford_corenlp_pywrapper/issues/40, or mute the thread https://github.com/notifications/unsubscribe-auth/AAAGjT8XsH0z0o15TeYbOUTjrLxKLOaxks5rjukrgaJpZM4MXF3m .

[jjm0022]

After doing some searching I came across this solution.

class suppress_stdout_stderr(object):
    '''
    A context manager for doing a "deep suppression" of stdout and stderr in 
    Python, i.e. will suppress all print, even if the print originates in a 
    compiled C/Fortran sub-function.
       This will not suppress raised exceptions, since exceptions are printed
    to stderr just before a script exits, and after the context manager has
    exited (at least, I think that is why it lets exceptions through).      

    '''
    def __init__(self):
        # Open a pair of null files
        self.null_fds =  [os.open(os.devnull,os.O_RDWR) for x in range(2)]
        # Save the actual stdout (1) and stderr (2) file descriptors.
        self.save_fds = (os.dup(1), os.dup(2))

    def __enter__(self):
        # Assign the null pointers to stdout and stderr.
        os.dup2(self.null_fds[0],1)
        os.dup2(self.null_fds[1],2)

    def __exit__(self, *_):
        # Re-assign the real stdout/stderr back to (1) and (2)
        os.dup2(self.save_fds[0],1)
        os.dup2(self.save_fds[1],2)
        # Close the null files
        os.close(self.null_fds[0])
        os.close(self.null_fds[1])

Then I just do

with suppress_stdout_stderr():
    self.process = CoreNLP('ner', corenlp_jars=['/path/to/jars/'])

And it works great for me. Thanks for the help!