def keyUp(key, pause=None, _pause=True):
if len(key) > <NUM_LIT:1>:<EOL><INDENT>key = key.lower()<EOL><DEDENT>_failSafeCheck()<EOL>platformModule._keyUp(key)<EOL>_autoPause(pause, _pause)<EOL>
Performs a keyboard key release (without the press down beforehand).

    Args:
      key (str): The key to be released up. The valid names are listed in
      KEYBOARD_KEYS.

    Returns:
      None