def keyDown(key, pause=None, _pause=True):
if len(key) > <NUM_LIT:1>:<EOL><INDENT>key = key.lower()<EOL><DEDENT>_failSafeCheck()<EOL>platformModule._keyDown(key)<EOL>_autoPause(pause, _pause)<EOL>
Performs a keyboard key press without the release. This will put that
    key in a held down state.

    NOTE: For some reason, this does not seem to cause key repeats like would
    happen if a keyboard key was held down on a text field.

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

    Returns:
      None