old_contents: #!/usr/bin/env python
  import os
  import hashlib
  import json
  import io
  
  from six.moves.urllib import request
  
  from dateutil.zoneinfo import rebuild
  
  METADATA_FILE = "zonefile_metadata.json"
  
  
  def main():
      with io.open(METADATA_FILE, 'r') as f:
          metadata = json.load(f)
  
      if not os.path.isfile(metadata['tzdata_file']):
          print("Downloading tz file from iana")
          request.urlretrieve(os.path.join(metadata['releases_url'],
                                           metadata['tzdata_file']),
                              metadata['tzdata_file'])
      with open(metadata['tzdata_file'], 'rb') as tzfile:
          sha_hasher = hashlib.sha512()
          sha_hasher.update(tzfile.read())
          sha_512_file = sha_hasher.hexdigest()
          assert metadata['tzdata_file_sha512'] == sha_512_file, "SHA failed for"
      print("Updating timezone information...")
      rebuild(metadata['tzdata_file'], zonegroups=metadata['zonegroups'],
              metadata=metadata)
      print("Done.")
  
  if __name__ == "__main__":
      main()
  
new_contents: #!/usr/bin/env python
  import os
  import hashlib
  import json
  import io
  
  from six.moves.urllib import request
  
  from dateutil.zoneinfo import rebuild
  
  METADATA_FILE = "zonefile_metadata.json"
  
  
  def main():
      with io.open(METADATA_FILE, 'r') as f:
          metadata = json.load(f)
  
      if not os.path.isfile(metadata['tzdata_file']):
          print("Downloading tz file from iana")
          request.urlretrieve(os.path.join(metadata['releases_url'],
                                           metadata['tzdata_file']),
                              metadata['tzdata_file'])
      with open(metadata['tzdata_file'], 'rb') as tzfile:
          sha_hasher = hashlib.sha512()
          sha_hasher.update(tzfile.read())
          sha_512_file = sha_hasher.hexdigest()
          assert metadata['tzdata_file_sha512'] == sha_512_file, "SHA failed for"
      print("Updating timezone information...")
      rebuild.rebuild(metadata['tzdata_file'], zonegroups=metadata['zonegroups'],
              metadata=metadata)
      print("Done.")
  
  if __name__ == "__main__":
      main()
  
subject: Fix import