use pathlib on test_deepreload

IPython/lib/tests/test_deepreload.py

@@ -1,34 +1,35 b''
 # -*- coding: utf-8 -*-
 """Test suite for the deepreload module."""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
-import os
+from pathlib import Path
 
 import nose.tools as nt
 
 from IPython.utils.syspathcontext import prepended_to_syspath
 from IPython.utils.tempdir import TemporaryDirectory
 from IPython.lib.deepreload import reload as dreload
 
 def test_deepreload():
     "Test that dreload does deep reloads and skips excluded modules."
     with TemporaryDirectory() as tmpdir:
         with prepended_to_syspath(tmpdir):
-            with open(os.path.join(tmpdir, 'A.py'), 'w') as f:
+            tmpdirpath = Path(tmpdir)
+            with open( tmpdirpath / 'A.py' , 'w') as f:
                 f.write("class Object(object):\n    pass\n")
-            with open(os.path.join(tmpdir, 'B.py'), 'w') as f:
+            with open( tmpdirpath / 'B.py' , 'w') as f:
                 f.write("import A\n")
             import A
             import B
 
             # Test that A is not reloaded.
             obj = A.Object()
             dreload(B, exclude=['A'])
             nt.assert_true(isinstance(obj, A.Object))
 
             # Test that A is reloaded.
             obj = A.Object()
             dreload(B)
             nt.assert_false(isinstance(obj, A.Object))