code: def gopen(name, *args, **kwargs):
      
      # filename declares gzip
      if name.endswith('.gz'):
          return gzip.open(name, *args, **kwargs)
  
      # open regular file
      fobj = open(name, *args, **kwargs)
      sig = fobj.read(3)
      fobj.seek(0)
      if sig == GZIP_SIGNATURE:  # file signature declares gzip
          fobj.close()  # GzipFile won't close orig file when it closes
          return gzip.open(name, *args, **kwargs)
      return fobj
docs: Open a file handling optional gzipping
  
      If ``name`` endswith ``'.gz'``, or if the GZIP file signature is
      found at the beginning of the file, the file will be opened with
      `gzip.open`, otherwise a regular file will be returned from `open`.
  
      Parameters
      ----------
      name : `str`
          path (name) of file to open.
  
      *args, **kwargs
          other arguments to pass to either `open` for regular files, or
          `gzip.open` for gzipped files.
  
      Returns
      -------
      file : `io.TextIoBase`, `file`, `gzip.GzipFile`
          the open file object