writing consecutive data to subprocess command 'more'

[SanPy]

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?

Regards,

Sander Smits