refactor db engine

alphamind/data/engines/universe.py

+# -*- coding: utf-8 -*-
+"""
+Created on 2017-7-7
+
+@author: cheng.li
+"""
+
+from typing import Iterable
+
+
+class Universe(object):
+
+    def __init__(self,
+                 include_universe: Iterable[str]=None,
+                 exclude_universe: Iterable[str]=None,
+                 include_codes: Iterable[str]=None,
+                 exclude_codes: Iterable[str]=None):
+
+        self.include_universe = include_universe
+        self.exclude_universe = exclude_universe
+        self.include_codes = include_codes
+        self.exclude_codes = exclude_codes
+