class _Getch: """Gets a single character from standard input. Does not echo to the screen.""" def __init__(self): try: self.impl = _GetchWindows() except ImportError: self.impl = _GetchUnix() def __call__(self): return self.impl() class _GetchUnix: """Fetch and character using the termios module.""" def __init__(self): import tty, sys from select import select def __call__(self): import sys, tty, termios from select import select fd = sys.stdin.fileno() old_settings = termios.tcgetattr(fd) try: tty.setraw(sys.stdin.fileno()) # [ Wait until ready for reading, # wait until ready for writing # wait for an "exception condition" ] # The below line times out after 1 second # This can be changed to a floating-point value if necessary [i, o, e] = select([sys.stdin.fileno()], [], [], 1) if i: ch = sys.stdin.read(1) else: ch = None finally: termios.tcsetattr(fd, termios.TCSADRAIN, old_settings) return ch class _GetchWindows: """Fetch a character using the Microsoft Visual C Runtime.""" def __init__(self): import msvcrt def __call__(self): import msvcrt import time # Delay timeout to match UNIX behaviour time.sleep(1) # Check if there is a character waiting, otherwise this would block if msvcrt.kbhit(): return msvcrt.getch() else: return getch = _Getch()