class_docstr: This class has shared methods used to
  normalize different statement models.
class_docstr_tok: ["This","class","has","shared","methods","used","to","normalize","different","statement","models","."]
docstr: Add a list of strings to the statement as tags.
docstr_tok: ["Add","a","list","of","strings","to","the","statement","as","tags","."]
code: def add_tags(self, *tags):
      """
      Add a list of strings to the statement as tags.
      """
      self.tags.extend(tags)
  
file_path: ChatterBot/chatterbot/conversation.py
imports: from pytz import UTC
  from datetime import datetime
  from dateutil import parser
label_desc: Use image node_id 3 for calling the StatementMixin obj's underlying member method code with example usage: obj.add_tags() without return types