#1162154: inspect.getmembers() now skips attributes that raise AttributeError,

e.g. a __slots__ attribute which has not been set.

Lib/inspect.py

@@ -253,7 +253,10 @@ def getmembers(object, predicate=None):
     Optionally, only return members that satisfy a given predicate."""
     results = []
     for key in dir(object):
-        value = getattr(object, key)
+        try:
+            value = getattr(object, key)
+        except AttributeError:
+            continue
         if not predicate or predicate(value):
             results.append((key, value))
     results.sort()

Lib/test/test_inspect.py

@@ -91,6 +91,17 @@ class TestPredicates(IsTestBase):
         self.assert_(inspect.isroutine(mod.spam))
         self.assert_(inspect.isroutine([].count))
 
+    def test_get_slot_members(self):
+        class C(object):
+            __slots__ = ("a", "b")
+
+        x = C()
+        x.a = 42
+        members = dict(inspect.getmembers(x))
+        self.assert_('a' in members)
+        self.assert_('b' not in members)
+
+
 class TestInterpreterStack(IsTestBase):
     def __init__(self, *args, **kwargs):
         unittest.TestCase.__init__(self, *args, **kwargs)

Misc/NEWS

@@ -137,7 +137,10 @@ Core and Builtins
 Library
 -------
 
-- Issue #1696199:  Add collections.Counter() for rapid and convenient
+- Issue #1162154: inspect.getmembers() now skips attributes that raise
+  AttributeError, e.g. a __slots__ attribute which has not been set.
+
+- Issue #1696199: Add collections.Counter() for rapid and convenient
   counting.
 
 - Issue #3860: GzipFile and BZ2File now support the context manager protocol.