@staticmethod
def _keypart(keymod: 'str') ->str:
    """Return first part of the internal keymod string +keymod+.
        
        Examples:
        >>> PhyscialInteractiveSprite._keypart(97) -> '97'
        >>> PhyscialInteractiveSprite._keypart(97 18) -> '97'
        """
    return keymod.split(' ')[0]
