code: def null_stemmer(object):
      """Converts given object to unicode with lower letters."""
      return to_unicode(object).lower()
  
file_path: sumy/sumy/nlp/stemmers/__init__.py
imports: from __future__ import absolute_import
  from __future__ import division, print_function, unicode_literals
  import nltk.stem.snowball
  from .czech import stem_word
  from .ukrainian import stem_word
  from .greek import stem_word
  from ..._compat import to_unicode
  from ...utils import normalize_language
label_desc: Use image node_id 1 for calling a global function with example usage: null_stemmer(object) and returns: to_unicode