code: def _get_key_file_path():
          
          if os.getenv(USER_HOME) is not None and os.access(os.getenv(USER_HOME),
                                                            os.W_OK):
              return os.path.join(os.getenv(USER_HOME), KEY_FILE_NAME)
  
          return os.path.join(os.getcwd(), KEY_FILE_NAME)
docs: Return the key file path.