code: def _IsBase64(cls, s):
      
      try:
        if base64.b64encode(base64.b64decode(s)).decode('utf-8') == s:
          return True
      except (TypeError, binascii.Error):
        pass
      return False
docs: An imperfect but decent method for determining if a string is base64.
  
      Args:
        s: A string with the data to test.
  
      Returns:
        True if s is base64, else False.