code: def norm(self, s):
      if self.normal_form:
          return normalize(self.normal_form, s)
      return s
  
imports: import os
  import sys
  import unittest
  import warnings
  from unicodedata import normalize
  from test.support import os_helper
  from test import support
label_desc: Use image node_id 2 for calling the UnicodeFileTests obj's underlying member method code with example usage: obj.norm(s) and returns: s, normalize