code: def _parse_from_import_source(self):
          
          assert self.current.value == 'from', self.current.value
          self.stream.move()
          is_future_import = self.current.value == '__future__'
          self.stream.move()
          while (self.current is not None and
                 self.current.kind in (tk.DOT, tk.NAME, tk.OP) and
                 self.current.value != 'import'):
              self.stream.move()
          if self.current is None or self.current.value != 'import':
              return False
          self.check_current(value='import')
          assert self.current.value == 'import', self.current.value
          self.stream.move()
          return is_future_import
docs: Parse the 'from x import' part in a 'from x import y' statement.
  
          Return true iff `x` is __future__.