<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def error(message, *args, **kwargs):
 """ write a message to stderr """

    if 'end' in kwargs:
        end = kwargs['end']
    else:
        end = '\n'

    if len(args) == 0:
        sys.stderr.write(message)
    else:
        sys.stderr.write(message % args)
    sys.stderr.write(end)
    sys.stderr.flush()