improvement for pickling

jedi/parsing.py

@@ -1187,6 +1187,9 @@ class NamePart(str):
     def end_pos(self):
         return self.start_pos[0], self.start_pos[1] + len(self)
 
+    def __getnewargs__(self):
+        return self.__class__, self.parent, self._start_pos
+
 
 class Name(Simple):
     """