Issue #10518: Bring back the callable() builtin.
Approved by Guido (BDFL) and Georg (RM).
diff --git a/Lib/test/test_bool.py b/Lib/test/test_bool.py
index 7282c0a..b296870 100644
--- a/Lib/test/test_bool.py
+++ b/Lib/test/test_bool.py
@@ -174,8 +174,8 @@
         self.assertIs(hasattr([], "wobble"), False)
 
     def test_callable(self):
-        self.assertIs(hasattr(len, '__call__'), True)
-        self.assertIs(hasattr(1, '__call__'), False)
+        self.assertIs(callable(len), True)
+        self.assertIs(callable(1), False)
 
     def test_isinstance(self):
         self.assertIs(isinstance(True, bool), True)