diff --git a/IPython/core/oinspect.py b/IPython/core/oinspect.py
index 80b9c2f..472611d 100644
--- a/IPython/core/oinspect.py
+++ b/IPython/core/oinspect.py
@@ -31,6 +31,7 @@ except ImportError:
 
 # IPython's own
 from IPython.core import page
+from IPython.testing.skipdoctest import skip_doctest_py3
 from IPython.utils import PyColorize
 from IPython.utils import io
 from IPython.utils import py3compat
@@ -297,6 +298,8 @@ class Inspector:
         else:
             print >>io.stdout, header,self.format(output),
 
+    # In Python 3, all classes are new-style, so they all have __init__.
+    @skip_doctest_py3
     def pdoc(self,obj,oname='',formatter = None):
         """Print the docstring for any object.
 
diff --git a/IPython/extensions/tests/test_autoreload.py b/IPython/extensions/tests/test_autoreload.py
index d4b4005..2227a06 100644
--- a/IPython/extensions/tests/test_autoreload.py
+++ b/IPython/extensions/tests/test_autoreload.py
@@ -11,6 +11,7 @@ import IPython.testing.tools as tt
 
 from IPython.extensions.autoreload import AutoreloadInterface
 from IPython.core.hooks import TryNext
+from IPython.testing.decorators import knownfailureif
 
 #-----------------------------------------------------------------------------
 # Test fixture
@@ -293,8 +294,12 @@ x = -99
         self.shell.run_code("pass") # trigger reload
         nt.assert_equal(mod.x, -99)
 
+    # The autoreload extension needs to be updated for Python 3.2, as .pyc files
+    # are stored in a different location. See gh-846.
+    @knownfailureif(sys.version_info >= (3,2))
     def test_smoketest_aimport(self):
         self._check_smoketest(use_aimport=True)
 
+    @knownfailureif(sys.version_info >= (3,2))
     def test_smoketest_autoreload(self):
         self._check_smoketest(use_aimport=False)
diff --git a/IPython/lib/tests/test_irunner.py b/IPython/lib/tests/test_irunner.py
index 642938b..dcad7aa 100644
--- a/IPython/lib/tests/test_irunner.py
+++ b/IPython/lib/tests/test_irunner.py
@@ -13,6 +13,7 @@ import unittest
 
 # IPython imports
 from IPython.lib import irunner
+from IPython.testing.decorators import known_failure_py3
 
 # Testing code begins
 class RunnerTestCase(unittest.TestCase):
@@ -56,6 +57,8 @@ class RunnerTestCase(unittest.TestCase):
         self.assert_(mismatch==0,'Number of mismatched lines: %s' %
                      mismatch)
 
+    # irunner isn't working on Python 3 (due to pexpect)
+    @known_failure_py3
     def testIPython(self):
         """Test the IPython runner."""
         source = """
@@ -129,6 +132,7 @@ In [12]: exit
         runner = irunner.IPythonRunner(out=self.out)
         self._test_runner(runner,source,output)
 
+    @known_failure_py3
     def testPython(self):
         """Test the Python runner."""
         runner = irunner.PythonRunner(out=self.out)
diff --git a/IPython/lib/tests/test_irunner_pylab_magic.py b/IPython/lib/tests/test_irunner_pylab_magic.py
index eb3f352..1d3ef7b 100644
--- a/IPython/lib/tests/test_irunner_pylab_magic.py
+++ b/IPython/lib/tests/test_irunner_pylab_magic.py
@@ -22,6 +22,7 @@ class RunnerTestCase(unittest.TestCase):
         self.out = StringIO.StringIO()
         #self.out = sys.stdout
 
+    @decorators.known_failure_py3
     def _test_runner(self,runner,source,output):
         """Test that a given runner's input/output match."""
 
@@ -82,6 +83,7 @@ Out\[6\]: True
         runner = irunner.IPythonRunner(out=self.out)
         self._test_runner(runner,source,output)
 
+    @decorators.known_failure_py3
     @decorators.skipif_not_matplotlib
     def test_pylab_import_all_disabled(self):
         "Verify that plot is not available when pylab_import_all = False"
diff --git a/IPython/testing/decorators.py b/IPython/testing/decorators.py
index 8f46202..661a9f1 100644
--- a/IPython/testing/decorators.py
+++ b/IPython/testing/decorators.py
@@ -323,6 +323,9 @@ skipif_not_sympy = skip_without('sympy')
 
 skip_known_failure = knownfailureif(True,'This test is known to fail')
 
+known_failure_py3 = knownfailureif(sys.version_info[0] >= 3, 
+                                    'This test is known to fail on Python 3.')
+
 # A null 'decorator', useful to make more readable code that needs to pick
 # between different decorators based on OS or other conditions
 null_deco = lambda f: f
diff --git a/IPython/testing/skipdoctest.py b/IPython/testing/skipdoctest.py
index bcb7e0a..0c18914 100644
--- a/IPython/testing/skipdoctest.py
+++ b/IPython/testing/skipdoctest.py
@@ -4,6 +4,7 @@ The IPython.testing.decorators module triggers various extra imports, including
 numpy and sympy if they're present. Since this decorator is used in core parts
 of IPython, it's in a separate module so that running IPython doesn't trigger
 those imports."""
+import sys
 
 def skip_doctest(f):
     """Decorator - mark a function or method for skipping its doctest.
@@ -13,3 +14,8 @@ def skip_doctest(f):
     etc."""
     f.skip_doctest = True
     return f
+
+def skip_doctest_py3(f):
+    """Decorator - skip the doctest under Python 3."""
+    f.skip_doctest = (sys.version_info[0] >= 3)
+    return f