Use less to page output

python-less-pager.py

import subprocess
import sys
import os


def output_to_pager(text, command=None):
    if not sys.stdout.isatty():
        for line in text:
            sys.stdout.write(line + os.linesep)
        return

    if command is None:
        # args stolen from git source, see `man less`
        command = "less -F -R -S -X -K".split()

    try:
        pager = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=sys.stdout)
        for line in text:
            pager.stdin.write((line + os.linesep).encode('utf8'))
        pager.stdin.close()
        pager.wait()
    except KeyboardInterrupt:
        pass
        # let less handle this, -K will exit cleanly