Index: Lib/inspect.py
===================================================================
--- Lib/inspect.py	(revisión: 69009)
+++ Lib/inspect.py	(copia de trabajo)
@@ -246,7 +246,7 @@
 
 def isabstract(object):
     """Return true if the object is an abstract base class (ABC)."""
-    return isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT
+    return bool(isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT)
 
 def getmembers(object, predicate=None):
     """Return all members of an object as (name, value) pairs sorted by name.
Index: Lib/test/test_inspect.py
===================================================================
--- Lib/test/test_inspect.py	(revisión: 69009)
+++ Lib/test/test_inspect.py	(copia de trabajo)
@@ -3,6 +3,7 @@
 import unittest
 import inspect
 import datetime
+import numbers
 
 from test.test_support import TESTFN, run_unittest
 
@@ -112,7 +113,12 @@
         self.assert_('a' in members)
         self.assert_('b' not in members)
 
+    def test_isabstract(self):
+        self.assertTrue(inspect.isabstract(numbers.Integral))
+        self.assertFalse(inspect.isabstract(int))
+        self.assertFalse(inspect.isabstract(5))
 
+
 class TestInterpreterStack(IsTestBase):
     def __init__(self, *args, **kwargs):
         unittest.TestCase.__init__(self, *args, **kwargs)