'Change stop bits size.'

@stopbits.setter
def stopbits(self, stopbits):

    if (stopbits not in self.STOPBITS):
        raise ValueError('Not    a    valid    stop    bit    size:    {!r}'.format(stopbits))
    self._stopbits = stopbits
    if self.is_open:
        self._reconfigure_port()
