bpo-42059: Fix required/optional keys for TypedDict(..., total=False) (…

…pythonGH-22736)

(cherry picked from commit 67b769f)

Co-authored-by: Alex Grönholm <alex.gronholm@nextday.fi>

Lib/test/test_typing.py

@@ -3899,10 +3899,14 @@ def test_total(self):
         self.assertEqual(D(), {})
         self.assertEqual(D(x=1), {'x': 1})
         self.assertEqual(D.__total__, False)
+        self.assertEqual(D.__required_keys__, frozenset())
+        self.assertEqual(D.__optional_keys__, {'x'})
 
         self.assertEqual(Options(), {})
         self.assertEqual(Options(log_level=2), {'log_level': 2})
         self.assertEqual(Options.__total__, False)
+        self.assertEqual(Options.__required_keys__, frozenset())
+        self.assertEqual(Options.__optional_keys__, {'log_level', 'log_path'})
 
     def test_optional_keys(self):
         class Point2Dor3D(Point2D, total=False):

Lib/typing.py

@@ -1980,14 +1980,14 @@ class body be required.
         raise TypeError("TypedDict takes either a dict or keyword arguments,"
                         " but not both")
 
-    ns = {'__annotations__': dict(fields), '__total__': total}
+    ns = {'__annotations__': dict(fields)}
     try:
         # Setting correct module is necessary to make typed dict classes pickleable.
         ns['__module__'] = sys._getframe(1).f_globals.get('__name__', '__main__')
     except (AttributeError, ValueError):
         pass
 
-    return _TypedDictMeta(typename, (), ns)
+    return _TypedDictMeta(typename, (), ns, total=total)
 
 _TypedDict = type.__new__(_TypedDictMeta, 'TypedDict', (), {})
 TypedDict.__mro_entries__ = lambda bases: (_TypedDict,)

Misc/NEWS.d/next/Library/2020-10-17-12-42-08.bpo-42059.ZGMZ3D.rst

@@ -0,0 +1 @@
+:class:`typing.TypedDict` types created using the alternative call-style syntax now correctly respect the ``total`` keyword argument when setting their ``__required_keys__`` and ``__optional_keys__`` class attributes.