disable_line_buffering.py

import sys
from select import select
import tty
import termios
import atexit


def disable_line_buffering():
    original_tty_attrs = termios.tcgetattr(sys.stdin)

    def restore_tty_attributes():
        termios.tcsetattr(sys.stdin, termios.TCSADRAIN, original_tty_attrs)

    atexit.register(restore_tty_attributes)
    tty.setcbreak(sys.stdin.fileno())


disable_line_buffering()

while True:
    readable_objs, _, _ = select([sys.stdin], [], [])
    for readable_obj in readable_objs:
        print(readable_obj.read(1))