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sys.stdin

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try:
    # windows
    import msvcrt
except ImportError:
    msvcrt = None
    import sys
    import termios
    import tty


def getch(length=1):
    """
    Read a key press and return the result. Nothing is echoed to the
    console.

    Note that on Windows a special function key press will return its
    keycode. `Control-C` cannot be read there.

    On Unices it will return one char by default. Thus, when reading
    a special function key, whose resulting escape sequence could be
    longer than one char, the `length` value might be changed, since
    otherwise the remaining characters would be returned by the next
    calls until stdin is "empty".
    """
    if msvcrt:
        char = msvcrt.getch()
        if char in ('\000', '\xe0'):
            # special key -> need a second call to get keycode
            char = msvcrt.getch()
        return char
    else:
        old = termios.tcgetattr(sys.stdin)
        try:
            tty.setraw(sys.stdin)
            return sys.stdin.read(length)
        finally:
            termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old)

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try:
    # windows
    import msvcrt
except ImportError:
    msvcrt = None
    import errno
    import fcntl
    import os
    import sys
    import termios
    import tty


def getch():
    """
    Read a key press and return the result. Nothing is echoed to the
    console.

    Note that on Windows a special function key press will return its
    keycode. `Control-C` cannot be read there.

    On Unices pressing a special key will return its escape sequence.
    """
    if msvcrt:
        char = msvcrt.getch()
        if char in ('\000', '\xe0'):
            # special key -> need a second call to get keycode
            char = msvcrt.getch()
        return char
    else:
        stdin = sys.stdin.fileno()
        old = termios.tcgetattr(stdin)
        try:
            tty.setraw(stdin)
            char = sys.stdin.read(1)
        finally:
            termios.tcsetattr(stdin, termios.TCSADRAIN, old)
        old = fcntl.fcntl(stdin, fcntl.F_GETFL)
        try:
            fcntl.fcntl(stdin, fcntl.F_SETFL, old | os.O_NONBLOCK)
            try:
                char += sys.stdin.read()
            except IOError, e:
                if e.errno == errno.EAGAIN:
                    # there was no more than one char to read
                    pass
                else:
                    raise
        finally:
            fcntl.fcntl(stdin, fcntl.F_SETFL, old)
        return char