Eric Snow's implementation of PEP 421.

Issue 14673: Add sys.implementation
diff --git a/Lib/types.py b/Lib/types.py
index 2bfcd9b..cfd09ea 100644
--- a/Lib/types.py
+++ b/Lib/types.py
@@ -13,6 +13,7 @@
 LambdaType = type(lambda: None)         # Same as FunctionType
 CodeType = type(_f.__code__)
 MappingProxyType = type(type.__dict__)
+SimpleNamespace = type(sys.implementation)
 
 def _g():
     yield 1