Python cross-platform listening for keypresses?

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I don’t know of any cross-platform lightweight module that listens for keypresses. But here’s a suggestion in case you want to implement something simple:

Check out this question on getting a single keypress at a time in the Python FAQ. You could experiment a bit with blocking reads from sys.stdin and threading. But this may only work on Unix. On Windows, you can use msvcrt.kbhit.

Combining the keypress recipe from the Python FAQ and the msvcrt module, the resulting kbhit function would go like this:

try:
    from msvcrt import kbhit
except ImportError:
    import termios, fcntl, sys, os
    def kbhit():
        fd = sys.stdin.fileno()
        oldterm = termios.tcgetattr(fd)
        newattr = termios.tcgetattr(fd)
        newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
        termios.tcsetattr(fd, termios.TCSANOW, newattr)
        oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
        fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
        try:
            while True:
                try:
                    c = sys.stdin.read(1)
                    return True
                except IOError:
                    return False
        finally:
            termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
            fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)

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