def _Pluralize(value, unused_context, args):
    """Formatter to pluralize words."""
    
    if len(args) == 0:
        s, p = '', 's'
    elif len(args) == 1:
        s, p = '', args[0]
    elif len(args) == 2:
        s, p = args
    else:
        # Should have been checked at compile time
        raise AssertionError
    
    if value > 1:
        return p
    else:
        return s
Formatter to pluralize words.