revert change 87a9dff5106c: pure Enum members again evaluate to True;

update Finer Points section of docs to cover boolean evaluation;
add more tests for pure and mixed boolean evaluation

2 files changed, 16 insertions, 4 deletions

diff --git a/Lib/enum.py b/Lib/enum.py
index 35a9c77935..ac89d6ba26 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -482,9 +482,6 @@ class Enum(metaclass=EnumMeta):
     def __str__(self):
         return "%s.%s" % (self.__class__.__name__, self._name_)
 
-    def __bool__(self):
-        return bool(self._value_)
-
     def __dir__(self):
         added_behavior = [
                 m
diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index e4e6c2b51a..7985948041 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -272,11 +272,26 @@ class TestEnum(unittest.TestCase):
                 _any_name_ = 9
 
     def test_bool(self):
+        # plain Enum members are always True
         class Logic(Enum):
             true = True
             false = False
         self.assertTrue(Logic.true)
-        self.assertFalse(Logic.false)
+        self.assertTrue(Logic.false)
+        # unless overridden
+        class RealLogic(Enum):
+            true = True
+            false = False
+            def __bool__(self):
+                return bool(self._value_)
+        self.assertTrue(RealLogic.true)
+        self.assertFalse(RealLogic.false)
+        # mixed Enums depend on mixed-in type
+        class IntLogic(int, Enum):
+            true = 1
+            false = 0
+        self.assertTrue(IntLogic.true)
+        self.assertFalse(IntLogic.false)
 
     def test_contains(self):
         Season = self.Season