<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def getch():
 """Request a single character input from the user."""


    if sys.platform in ['darwin', 'linux']:
        import termios
        import tty
        file_descriptor = sys.stdin.fileno()
        settings = termios.tcgetattr(file_descriptor)
        try:
            tty.setraw(file_descriptor)
            return sys.stdin.read(1)
        finally:
            termios.tcsetattr(file_descriptor, termios.TCSADRAIN, settings)
    elif sys.platform in ['cygwin', 'win32']:
        import msvcrt
        return msvcrt.getwch()