code: def verify_key_in_shelve(file_name, save_key, file_location):
      
      file = __os.path.join(file_location, file_name)
      shelve_store = __shelve.open(file)
      exists = shelve_store.get(save_key)
      shelve_store.close()
      if exists:
          return True
  
      elif not exists:
          return False
docs: Function to check for a key in a shelve
      Args:
          file_name: Shelve storage file name
          save_key: The name of the key the item is stored in
          file_location: The location of the file, derive from the os module
  
      Returns: returns true or false