code: def register_contaminant_python(self, dirt_string):
      self.dirt_ngrams.update(
          word_ngrams(self.normalize_string(dirt_string), self.ngram_n)
      )
  
imports: import re
  import string
  import timeit
  import pickle
  import traceback
  from pprint import pprint
label_desc: Use image node_id 10 for calling the Janitor obj's underlying member method code with example usage: obj.register_contaminant_python(dirt_string) without return types