retrieve output for a specified kernel
             Parameters
            ==========
            kernel: the kernel to output
            path: the path to pull files to on the filesystem
            force: if output already exists, force overwrite (default False)
            quiet: suppress verbosity (default is True)

def kernels_output(self, kernel, path, force=False, quiet=True):
        """ retrieve output for a specified kernel
             Parameters
            ==========
            kernel: the kernel to output
            path: the path to pull files to on the filesystem
            force: if output already exists, force overwrite (default False)
            quiet: suppress verbosity (default is True)
        """
        if kernel is None:
            raise ValueError('A kernel must be specified')
        if '/' in kernel:
            self.validate_kernel_string(kernel)
            kernel_url_list = kernel.split('/')
            owner_slug = kernel_url_list[0]
            kernel_slug = kernel_url_list[1]
        else:
            owner_slug = self.get_config_value(self.CONFIG_NAME_USER)
            kernel_slug = kernel

        if path is None:
            target_dir = self.get_default_download_dir('kernels', owner_slug,
                                                       kernel_slug, 'output')
        else:
            target_dir = path

        if not os.path.exists(target_dir):
            os.makedirs(target_dir)

        if not os.path.isdir(target_dir):
            raise ValueError(
                'You must specify a directory for the kernels output')

        response = self.process_response(
            self.kernel_output_with_http_info(owner_slug, kernel_slug))
        outfiles = []
        for item in response['files']:
            outfile = os.path.join(target_dir, item['fileName'])
            outfiles.append(outfile)
            download_response = requests.get(item['url'])
            if force or self.download_needed(item, outfile, quiet):
                os.makedirs(os.path.split(outfile)[0], exist_ok=True)
                with open(outfile, 'wb') as out:
                    out.write(download_response.content)
                if not quiet:
                    print('Output file downloaded to %s' % outfile)

        log = response['log']
        if log:
            outfile = os.path.join(target_dir, kernel_slug + '.log')
            outfiles.append(outfile)
            with open(outfile, 'w') as out:
                out.write(log)
            if not quiet:
                print('Kernel log downloaded to %s ' % outfile)

        return outfiles