class_docstr: Returns the text in lowercase.
code: def get_text_index_string(self, text):
      return text.lower()
  
file_path: ChatterBot/chatterbot/tagging.py
imports: import string
  from chatterbot import languages
label_desc: Use image node_id 2 for calling the LowercaseTagger obj's underlying member method code with example usage: obj.get_text_index_string(text) and returns: text