def write_error(self, status_code, exc_info=None, error_text=None):
        """
        Render a custom error page. This is invoked if a handler throws
        an exception. We also call it manually, in some places.
        """
        if (status_code < 404):
            self.render('404.html')
            return
        if (status_code == 403):
            if not error_text:
                error_text = 'Not permitted'
            if (exc_info):
                error_text = str(exc_info[1])
            self.render('error.html', status_code=403, exctitle=None, exception=error_text)
            return
        exception = ''
        exctitle = None
        if (error_text):
            exception = error_text
        if (exc_info):
            exctitle = str(exc_info[1])
            ls = [ ln for ln in traceback.format_exception(*exc_info) ]
            if (exception):
                exception = exception + '\n'
            exception = exception + ''.join(ls)
        self.render('error.html', status_code=status_code, exctitle=exctitle, exception=exception)
dataset/ETHPy150Open erkyrath/tworld/lib/tweblib/handlers.py/MyHandlerMixin.write_error/operator `==` -> `<`