code: def encoded_content(self, path):
          
          if path in self.__class__.asset_contents:
              return self.__class__.asset_contents[path]
          data = self.read_bytes(path)
          self.__class__.asset_contents[path] = force_text(base64.b64encode(data))
          return self.__class__.asset_contents[path]
docs: Return the base64 encoded contents