How to use the graphistry.util function in graphistry

def _check_key_and_version():
        params = {'text': PyGraphistry.api_key()}
        try:
            response = requests.get(PyGraphistry._check_url(), params=params, timeout=(3,3),
                                    verify=PyGraphistry._config['certificate_validation'])
            response.raise_for_status()
            jres = response.json()

            cver = sys.modules['graphistry'].__version__
            if  'pygraphistry' in jres and 'minVersion' in jres['pygraphistry'] and 'latestVersion' in jres['pygraphistry']:
                mver = jres['pygraphistry']['minVersion']
                lver = jres['pygraphistry']['latestVersion']
                if util.compare_versions(mver, cver) > 0:
                    util.warn('Your version of PyGraphistry is no longer supported (installed=%s latest=%s). Please upgrade!' % (cver, lver))
                elif util.compare_versions(lver, cver) > 0:
                    print('A new version of PyGraphistry is available (installed=%s latest=%s).' % (cver, lver))

            if jres['success'] is not True:
                util.warn(jres['error'])
        except Exception as e:
            util.warn('Could not contact %s. Are you connected to the Internet?' % PyGraphistry._config['hostname'])

def _check_key_and_version():
        params = {'text': PyGraphistry.api_key()}
        try:
            response = requests.get(PyGraphistry._check_url(), params=params, timeout=(3,3),
                                    verify=PyGraphistry._config['certificate_validation'])
            response.raise_for_status()
            jres = response.json()

            cver = sys.modules['graphistry'].__version__
            if  'pygraphistry' in jres and 'minVersion' in jres['pygraphistry'] and 'latestVersion' in jres['pygraphistry']:
                mver = jres['pygraphistry']['minVersion']
                lver = jres['pygraphistry']['latestVersion']
                if util.compare_versions(mver, cver) > 0:
                    util.warn('Your version of PyGraphistry is no longer supported (installed=%s latest=%s). Please upgrade!' % (cver, lver))
                elif util.compare_versions(lver, cver) > 0:
                    print('A new version of PyGraphistry is available (installed=%s latest=%s).' % (cver, lver))

            if jres['success'] is not True:
                util.warn(jres['error'])
        except Exception as e:
            util.warn('Could not contact %s. Are you connected to the Internet?' % PyGraphistry._config['hostname'])

f.write(json_dataset)
                else:
                    f.write(json_dataset.encode('utf8'))
        elif mode == 'vgraph':
            bin_dataset = dataset.SerializeToString()
            with gzip.GzipFile(fileobj=out_file, mode='w', compresslevel=9) as f:
                f.write(bin_dataset)
        else:
            raise ValueError('Unknown mode:', mode)

        size = old_div(len(out_file.getvalue()), 1024)
        if size >= 5 * 1024:
            print('Uploading %d kB. This may take a while...' % size)
            sys.stdout.flush()
        elif size > 50 * 1024:
            util.error('Dataset is too large (%d kB)!' % size)

        return out_file

util.warn('Syntax error in %s, skipping. (%s)' % (path, e.message))
            pass
        except IOError:
            pass

    env_config = {k: os.environ.get(v) for k, v in EnvVarNames.items()}
    env_override = {k: v for k, v in env_config.items() if v != None}
    config.update(env_override)
    if not config['certificate_validation']:
        requests.packages.urllib3.disable_warnings()
    return config


class PyGraphistry(object):
    _config = _get_initial_config()
    _tag = util.fingerprint()
    _is_authenticated = False


    @staticmethod
    def authenticate():
        """Authenticate via already provided configuration.
        This is called once automatically per session when uploading and rendering a visualization."""
        key = PyGraphistry.api_key()
        #Mocks may set to True, so bypass in that case
        if (key is None) and PyGraphistry._is_authenticated == False:
            util.error('API key not set explicitly in `register()` or available at ' + EnvVarNames['api_key'])
        if not PyGraphistry._is_authenticated:
            PyGraphistry._check_key_and_version()
            PyGraphistry._is_authenticated = True