code: def _file_size(file_path, uncompressed=False):
      
      _, ext = os.path.splitext(file_path)
  
      if uncompressed:
          if ext in {".gz", ".gzip"}:
              with gzip.GzipFile(file_path, mode="rb") as fp:
                  try:
                      fp.seek(0, os.SEEK_END)
                      return fp.tell()
                  except ValueError:
                      # on python2, cannot seek from end and must instead read to end
                      fp.seek(0)
                      while len(fp.read(8192)) != 0:
                          pass
                      return fp.tell()
          elif ext in {".bz", ".bz2", ".bzip", ".bzip2"}:
              with bz2.BZ2File(file_path, mode="rb") as fp:
                  fp.seek(0, os.SEEK_END)
                  return fp.tell()
  
      return os.path.getsize(file_path)
docs: Return size of a single file, compressed or uncompressed