writing consecutive data to subprocess command 'more'
jhmsmits at gmail.com
Sun May 3 03:06:37 EDT 2009
Hmm, it works as long as the pager command is available on the system.
I created a test file to explain what I mean. You can find it here:
The 'pager' command is on purpose a command that is not available on
It should fall back to sys.stdout in the write method. However, it
does not show any output at all.
Strangely enough, when a put a time.sleep(1) between the first and
second printer.write statements, the second and third statement do
Btw, the normal pager command works fine on my system.
How can I solve this, so that the fallback sys.stdout does show
On 2 mei, 23:00, SanPy <jhmsm... at gmail.com> wrote:
> Thanks, that works beautifully!
> On 2 mei, 22:35, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> > communicate writes to the child's stdin and waits for it to finish. If you
> > want to keep writing, don't use communicate. And you'll need to keep state
> > from one call to another, so use a class. Based on the code above, create
> > a class Pager with __init__, write and close methods:
> > class Pager:
> > def __init__(self):
> > # copy the logic above
> > self.proc = subprocess.Popen(...)
> > self.file = self.proc.stdin
> > # if something goes wrong, set self.proc=None and self.file=sys.stdout
> > def write(self, text):
> > self.file.write(text)
> > def close(self):
> > if self.proc:
> > self.file.close()
> > self.proc.wait()
> > Also, take a look at the pager function in the pydoc module (see the
> > source) - it handles several cases.
> > --
> > Gabriel Genellina
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