code: def _init():
      '''
      Connect to S3 and download the metadata for each file in all buckets
      specified and cache the data to disk.
      '''
      cache_file = _get_buckets_cache_filename()
      exp = time.time() - S3_CACHE_EXPIRE
  
      # check mtime of the buckets files cache
      metadata = None
      try:
          if os.path.getmtime(cache_file) > exp:
              metadata = _read_buckets_cache_file(cache_file)
      except OSError:
          pass
  
      if metadata is None:
          # bucket files cache expired or does not exist
          metadata = _refresh_buckets_cache_file(cache_file)
  
      return metadatf _init():
      '''
      Connect to S3 and download the metadata for each file in all buckets
      specified and cache the data to disk.
      '''
      cache_file = _get_buckets_cache_filename()
      exp = time.time() - S3_CACHE_EXPIRE
  
      # check mtime of the buckets files cache
      metadata = None
      try:
          if os.path.getmtime(cache_file) > exp:
              metadata = _read_buckets_cache_file(cache_file)
      except OSError:
          pass
  
      if metadata is None:
          # bucket files cache expired or does not exist
          metadata = _refresh_buckets_cache_file(cache_file)
  
      return metadata
docs: Connect to S3 and download the metadata for each file in all buckets
      specified and cache the data to disk.