set GCE instance labels using Google client library in Python

main.py

resp = compute.instances().get(project=project_id, zone=zone, instance=instance_name).execute()
if 'error' in resp:
   print('Failed to get GCE instance info')
   exit(1)
fingerprint = resp['labelFingerprint']
resp = compute.instances().setLabels(project=project_id, zone=zone, instance=instance_name,
                                     body={'labelFingerprint': fingerprint,
                                           'labels': labels}).execute()