code: def tcex_json(self):
          
          file_fqpn = os.path.join(self.app_path, 'tcex.json')
          if self._tcex_json is None:
              if os.path.isfile(file_fqpn):
                  try:
                      with open(file_fqpn, 'r') as fh:
                          self._tcex_json = json.load(fh)
                  except ValueError as e:
                      self.handle_error('Failed to load "{}" file ({}).'.format(file_fqpn, e))
              else:
                  self.handle_error('File "{}" could not be found.'.format(file_fqpn))
          return self._tcex_json
docs: Return tcex.json file contents.