List unused PVC’s inside project using Python

import sys
import datetime
import time
from kubernetes import config, client
import urllib3urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
def log(msg):
  print ("[ {} ] :: {}".format(datetime.datetime.now(), msg) )try:
  NAMESPACE = sys.argv[1]
except IndexError:
  print("ERROR: missing some input")
  print("Usage: {} '<NAMESPACE>'".format(sys.argv[0]))
  sys.exit(1)#log ("Startup")
config.load_kube_config()
kube_client = client.CoreV1Api()#log ("find pvc's")
all_pvc_list= []
for pvc in kube_client.list_namespaced_persistent_volume_claim(NAMESPACE).items:
#    print (pvc.metadata.name)
    all_pvc_list.append(pvc.metadata.name)#log ("find mounted pvc's")mounted_pvc_list = []
for pod in kube_client.list_namespaced_pod(NAMESPACE).items:
    if str(pod.spec.volumes) != "None":
        for volume in pod.spec.volumes:
            if str(volume.persistent_volume_claim) != "None":
                mounted_pvc_list.append(volume.persistent_volume_claim.claim_name)#log ("unmounted pvc's")
unmounted_pvc = list(set(all_pvc_list) - set(mounted_pvc_list))
output = ['   ' + sub for sub in unmounted_pvc]
if output:
  print(NAMESPACE)
  print(*output, sep = "\n")