get_key_async.py

import os
import select
import sys

import time

if os.name == 'nt':
    import msvcrt
else:
    import tty
    import termios


class GetKey:
    def __init__(self):
        self.is_nt = os.name == 'nt'

    def __enter__(self):
        if not self.is_nt:
            self.settings = termios.tcgetattr(sys.stdin)
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        termios.tcsetattr(sys.stdin, termios.TCSADRAIN, self.settings)

    def get_key(self) -> str:
        if self.is_nt:
            timeout = 0.1
            start_time = time.time()
            while 1:
                if msvcrt.kbhit():
                    if sys.version_info[0] >= 3:
                        return msvcrt.getch().decode()
                    else:
                        return msvcrt.getch()
                elif time.time() - start_time > timeout:
                    return ''

        tty.setraw(sys.stdin.fileno())
        rlist, _, _ = select.select([sys.stdin], [], [], 0.1)
        if rlist:
            key = sys.stdin.read(1)
        else:
            key = ''

        termios.tcsetattr(sys.stdin, termios.TCSADRAIN, self.settings)
        return key