code: def get_text_stream(name, encoding=None, errors='strict'):
      
      opener = text_streams.get(name)
      if opener is None:
          raise TypeError('Unknown standard stream %r' % name)
      return opener(encoding, errors)
docs: Returns a system stream for text processing.  This usually returns
      a wrapped stream around a binary stream returned from
      :func:`get_binary_stream` but it also can take shortcuts on Python 3
      for already correctly configured streams.
  
      :param name: the name of the stream to open.  Valid names are ``'stdin'``,
                   ``'stdout'`` and ``'stderr'``
      :param encoding: overrides the detected default encoding.
      :param errors: overrides the default error mode.