How to use the gabbi.utils.get_colorizer function in gabbi

def __init__(self, stream, descriptions, verbosity):
        super(ConciseTestResult, self).__init__(
            stream, descriptions, verbosity)
        self.colorize = utils.get_colorizer(stream)

def __init__(self, **kwargs):
        self.caption = kwargs.pop('caption')
        self._show_body = kwargs.pop('body')
        self._show_headers = kwargs.pop('headers')
        self._use_color = kwargs.pop('colorize')
        self._stream = kwargs.pop('stream')
        if self._use_color:
            self.colorize = utils.get_colorizer(self._stream)
        super(VerboseHttp, self).__init__(**kwargs)