code: def _new_unzip(fname, prefix=""):
      """Fake unzipping."""
      if fname[-3:] == "bz2":
          return prefix + fname[:-4]
      return fname
  
imports: from __future__ import annotations
  import contextlib
  import unittest
  import warnings
  from datetime import datetime
  from typing import Any, Dict
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  from satpy.readers.ahi_hsd import AHIHSDFileHandler
  from satpy.readers.utils import get_geostationary_mask
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 1 for calling a global function with example usage: _new_unzip(fname, prefix) and returns: fname, unknown