code: def new_transient(self, ext=''):
          '''Creates empty TransientFile with random name and given extension.
          File on FS is not created'''
          name = random_name(self.transient_length) + ext
          return TransientFile(self.transient_root, name, selff new_transient(self, ext=''):
          '''Creates empty TransientFile with random name and given extension.
          File on FS is not created'''
          name = random_name(self.transient_length) + ext
          return TransientFile(self.transient_root, name, self)
docs: Creates empty TransientFile with random name and given extension.
          File on FS is not created