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Groups > comp.lang.python > #79273

Re: Flush stdin

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On 2014-10-18 17:55, Nobody wrote:
> On Fri, 17 Oct 2014 12:38:54 +0100, Empty Account wrote:
> 
> > I am using netcat to listen to a port and python to read stdin
> > and print to the console.
> > 
> > nc -l 2003 | python print_metrics.py
> > 
> > sys.stdin.flush() doesn’t seem to flush stdin,
> 
> You can't "flush" an input stream.

You can't flush it, but you can make it unbuffered.  You can either
force python to use unbuffered stdio:

  python -u myfile.py

or you can get an unbuffered handle to the file

 import os, sys
 buffer_size = 1
 new_stdin = os.fdopen(sys.stdin.fileno(), 'r', buffer_size)
 for c in new_stdin:
   do_something(c)

though based on my reading, the first method works with both Py2
and Py3k while the second method doesn't reliably work in Py3k.

-tkc

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Flush stdin Empty Account <emptya45@gmail.com> - 2014-10-17 12:38 +0100
  Re: Flush stdin Nobody <nobody@nowhere.invalid> - 2014-10-18 17:55 +0100
    Re: Flush stdin Tim Chase <python.list@tim.thechases.com> - 2014-10-18 12:32 -0500
      Re: Flush stdin Nobody <nobody@nowhere.invalid> - 2014-10-19 02:11 +0100
        Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-18 18:34 -0700
        Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-18 18:42 -0700
          Re: Flush stdin Nobody <nobody@nowhere.invalid> - 2014-10-22 03:49 +0100
            Re: Flush stdin Dan Stromberg <drsalists@gmail.com> - 2014-10-21 20:11 -0700
    Re: Flush stdin MRAB <python@mrabarnett.plus.com> - 2014-10-18 18:55 +0100
    Re: Flush stdin Cameron Simpson <cs@zip.com.au> - 2014-10-19 08:01 +1100
    Re: Flush stdin Terry Reedy <tjreedy@udel.edu> - 2014-10-18 18:35 -0400

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