code: def download(cls, filename, input_dir, dl_dir=None):
          
          file_info = cls.parse_remote(filename)
          if not dl_dir:
              dl_dir = os.path.join(input_dir, file_info.container,
                                    os.path.dirname(file_info.blob))
              utils.safe_makedir(dl_dir)
  
          out_file = os.path.join(dl_dir, os.path.basename(file_info.blob))
  
          if not utils.file_exists(out_file):
              with file_transaction({}, out_file) as tx_out_file:
                  blob_service = cls.connect(filename)
                  blob_service.get_blob_to_path(
                      container_name=file_info.container,
                      blob_name=file_info.blob,
                      file_path=tx_out_file)
          return out_file
docs: Download the resource from the storage.