Resolve issue#52 (#53)

kanghyojun · web-flow · commit c68554bdcaff · 2017-02-07T22:25:22.000+09:00
* Change compat condition of is_union_type

* Remove unnecessary condition

* 0.3.5
diff --git a/nirum/__init__.py b/nirum/__init__.py
@@ -2,5 +2,5 @@
 ~~~~~~~~~~~~~~~
 
 """
-__version_info__ = 0, 3, 4
+__version_info__ = 0, 3, 5
 __version__ = '.'.join(str(v) for v in __version_info__)
diff --git a/nirum/_compat.py b/nirum/_compat.py
@@ -25,23 +25,22 @@ def dst(self, dt):
     utc = UTC()
 
 
-if hasattr(typing, 'UnionMeta'):
+if hasattr(typing, '_Union'):
     def is_union_type(type_):
-        return isinstance(type_, typing.UnionMeta) or \
-            isinstance(type(type_), typing.UnionMeta)
+        return isinstance(type_, typing._Union)
 
     def get_union_types(type_):
         if is_union_type(type_):
-            return type_.__union_params__ \
-                if hasattr(type_, '__union_params__') \
-                else type_.__args__
+            return type_.__args__
 else:
     def is_union_type(type_):
-        return isinstance(type_, typing._Union)
+        return isinstance(type_, typing.UnionMeta)
 
     def get_union_types(type_):
         if is_union_type(type_):
-            return type_.__args__
+            return type_.__union_params__ \
+                if hasattr(type_, '__union_params__') \
+                else type_.__args__
 
 
 def get_abstract_param_types(type_):
