Thanks, that works beautifully! Regards, Sander
On 2 mei, 22:35, "Gabriel Genellina" <gagsl-...@yahoo.com.ar> wrote: > En Sat, 02 May 2009 15:53:17 -0300, SanPy <jhmsm...@gmail.com> escribió: > > > > > > > I have this method that prints a given text via a subprocess command > > 'more' . It is like this: > > > def print_by_page(text): > > if hasattr(sys.stdout, 'isatty') and sys.stdout.isatty(): > > viewer = 'more -EMR' > > proc = subprocess.Popen([viewer], shell=True, > > stdin=subprocess.PIPE, > > stderr=subprocess.PIPE) > > try: > > stdout, stderr = proc.communicate(text) > > except OSError: > > pass > > else: > > if stderr: # probably no 'more' available on this system > > sys.stdout.write(text) > > return > > sys.stdout.write(text) > > > It works fine, but what I really want to do is first print a header > > through the 'more' command, then fetch some data from the web, and > > show it through the same 'more' command/process. And even more data, > > another header, other data from the web, all through the same 'more' > > command/process. > > Can somebody help me out on this? > > 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 -- http://mail.python.org/mailman/listinfo/python-list
