Don't monkeypatch nose in Python 3, as it must be a newer version.

IPython/testing/nosepatch.py

@@ -1,68 +1,71 b''
 """Monkeypatch nose to accept any callable as a method.
 
 By default, nose's ismethod() fails for static methods.
 Once this is fixed in upstream nose we can disable it.
 
 Note: merely importing this module causes the monkeypatch to be applied."""
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2009  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import unittest
+import sys
 import nose.loader
 from inspect import ismethod, isfunction
 
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
 
 def getTestCaseNames(self, testCaseClass):
     """Override to select with selector, unless
     config.getTestCaseNamesCompat is True
     """
     if self.config.getTestCaseNamesCompat:
         return unittest.TestLoader.getTestCaseNames(self, testCaseClass)
 
     def wanted(attr, cls=testCaseClass, sel=self.selector):
         item = getattr(cls, attr, None)
         # MONKEYPATCH: replace this:
         #if not ismethod(item):
         #    return False
         # return sel.wantMethod(item)
         # With:
         if ismethod(item):
             return sel.wantMethod(item)
         # static method or something. If this is a static method, we
         # can't get the class information, and we have to treat it
         # as a function.  Thus, we will miss things like class
         # attributes for test selection
         if isfunction(item):
             return sel.wantFunction(item)
         return False
         # END MONKEYPATCH
     
     cases = filter(wanted, dir(testCaseClass))
     for base in testCaseClass.__bases__:
         for case in self.getTestCaseNames(base):
             if case not in cases:
                 cases.append(case)
     # add runTest if nothing else picked
     if not cases and hasattr(testCaseClass, 'runTest'):
         cases = ['runTest']
     if self.sortTestMethodsUsing:
         cases.sort(self.sortTestMethodsUsing)
     return cases
 
 
 ##########################################################################
 # Apply monkeypatch here
+# Python 3 must be running with newer version of Nose, so don't touch anything.
+if sys.version_info[0] < 3:
 nose.loader.TestLoader.getTestCaseNames = getTestCaseNames
 ##########################################################################