text: import re
  
  import textblob
  
  from .base import RegexDetector
  from ..implement import NameImplement
  from ..utils import CanonicalStringSet
  
  
  class NameDetector(RegexDetector):
      """Use part of speech tagging to clean proper nouns out of the dirty dirty
      ``text``. Disallow particular nouns by adding them to the
      ``NameDetector.disallowed_nouns`` set.
      """
      filth_cls = NameImplement
  
      disallowed_nouns = CanonicalStringSet(["skype"])
  
      def iter_filth(self, text):
  
          if not isinstance(self.disallowed_nouns, CanonicalStringSet):
              raise TypeError(
                  'NameDetector.disallowed_nouns must be CanonicalStringSet'
              )
  
          # find the set of proper nouns using textblob.
          proper_nouns = set()
          blob = textblob.TextBlob(text)
          for word, part_of_speech in blob.tags:
              is_proper_noun = part_of_speech in ("NNP", "NNPS")
              if is_proper_noun and word.lower() not in self.disallowed_nouns:
                  proper_nouns.add(word)
  
          # use a regex to replace the proper nouns by first escaping any
          # lingering punctuation in the regex
          # http://stackoverflow.com/a/4202559/564709
          if proper_nouns:
              re_list = []
              for proper_noun in proper_nouns:
                  re_list.append(r'\b' + re.escape(str(proper_noun)) + r'\b')
              self.filth_cls.regex = re.compile('|'.join(re_list))
          else:
              self.filth_cls.regex = None
          return super(NameDetector, self).iter_filth(text)
  