code: def to_python(self, value):
          
          if value in self.empty_values:
              try:
                  return self.empty_value
              except AttributeError:
                  # CharField.empty_value was introduced in Django 1.11; in prior
                  # versions a unicode string was returned for empty values in
                  # all cases.
                  return u''
          return bleach.clean(value, **self.bleach_options)
docs: Strips any dodgy HTML tags from the input