text: import pickle
  import datetime
  import os
  from google_auth_oauthlib.flow import Flow, InstalledAppFlow
  from googleapiclient.discovery import build
  from googleapiclient.http import MediaFileUpload
  from google.auth.transport.requests import Request
  
  # credit to: jie jenn https://www.youtube.com/user/jiejenn
  
  
  def Create_Service(client_secret_file, api_name, api_version, *scopes):
      print(client_secret_file, api_name, api_version, scopes, sep='-')
      CLIENT_SECRET_FILE = client_secret_file
      API_SERVICE_NAME = api_name
      API_VERSION = api_version
      SCOPES = [scope for scope in scopes[0]]
      print(SCOPES)
  
      cred = None
  
      if os.environ.get("PICKLE_FILE"):
          pickle_file = os.environ.get("PICKLE_FILE")
      else:
          pickle_file = f'token_{API_SERVICE_NAME}_{API_VERSION}.pickle'
  
      if os.path.exists(pickle_file):
          with open(pickle_file, 'rb') as token:
              cred = pickle.load(token)
  
      if not cred or not cred.valid:
          if cred and cred.expired and cred.refresh_token:
              cred.refresh(Request())
          else:
              flow = InstalledAppFlow.from_client_secrets_file(
                  CLIENT_SECRET_FILE, SCOPES)
              cred = flow.run_local_server()
  
          with open(pickle_file, 'wb') as token:
              pickle.dump(cred, token)
  
      try:
          service = build(API_SERVICE_NAME, API_VERSION, credentials=cred)
          print(API_SERVICE_NAME, 'service created successfully')
          return service
      except Exception as e:
          print(e)
          return None
  
  
  def convert_to_RFC_datetime(year=1900, month=1, day=1, hour=0, minute=0):
      dt = datetime.datetime(year, month, day, hour, minute, 0).isoformat() + 'Z'
      return dt
  
  
  if __name__ == "__main__":
      Create_Service("client_secret.json", "GMAIL",
                 "v1", ["https://mail.google.com/"])
  