From 0e0563ca2c6d67126f33ea077ddea19af71f14eb Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Tue, 5 Apr 2016 14:54:25 -0700
Subject: Add Text=str. Make ItemsView derive from AbstractSet, not Set (which
 is the concrete set).

---
 Lib/typing.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Lib/typing.py b/Lib/typing.py
index de2a462..6ead3c4 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -65,6 +65,7 @@ __all__ = [
     'no_type_check',
     'no_type_check_decorator',
     'overload',
+    'Text',
 ]
 
 # The pseudo-submodules 're' and 'io' are part of the public
@@ -1519,7 +1520,7 @@ class KeysView(MappingView[KT], AbstractSet[KT],
 
 
 class ItemsView(MappingView[Tuple[KT, VT_co]],
-                Set[Tuple[KT, VT_co]],
+                AbstractSet[Tuple[KT, VT_co]],
                 Generic[KT, VT_co],
                 extra=collections_abc.ItemsView):
     pass
@@ -1592,6 +1593,10 @@ def NamedTuple(typename, fields):
     return cls
 
 
+# Python-version-specific alias (Python 2: unicode; Python 3: str)
+Text = str
+
+
 class IO(Generic[AnyStr]):
     """Generic base class for TextIO and BinaryIO.
 
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