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[Python-Dev] [Python-checkins] cpython (3.4): - Issue #22966: Fix __pycache__ pyc file name clobber when pyc_compile is

[Python-Dev] [Python-checkins] cpython (3.4): - Issue #22966: Fix __pycache__ pyc file name clobber when pyc_compile isBarry Warsaw barry at python.org
Tue Dec 2 17:28:49 CET 2014
On Dec 02, 2014, at 06:44 AM, Jeremy Kloth wrote:

>This test is failing on the Windows buildbots due to the hard-coded
>path separator.  Using `os.pathsep` should work assuming that
>importlib returns normalized paths.

Good catch, thanks, however os.path would be the one to use.  Here's the patch
that should fix it.  This passes for me on Ubuntu, but I don't have a Windows
machine to do a test build on atm, so I'll just commit this and see how the
buildbots handle it.

diff -r 8badbd65840e Lib/test/test_py_compile.py
--- a/Lib/test/test_py_compile.py	Tue Dec 02 09:24:06 2014 +0200
+++ b/Lib/test/test_py_compile.py	Tue Dec 02 11:27:16 2014 -0500
@@ -106,9 +106,13 @@
         weird_path = os.path.join(self.directory, 'foo.bar.py')
         cache_path = importlib.util.cache_from_source(weird_path)
         pyc_path = weird_path + 'c'
+        head, tail = os.path.split(cache_path)
+        penultimate_tail = os.path.basename(head)
         self.assertEqual(
-            '/'.join(cache_path.split('/')[-2:]),
-            '__pycache__/foo.bar.{}.pyc'.format(sys.implementation.cache_tag))
+            os.path.join(penultimate_tail, tail),
+            os.path.join(
+                '__pycache__',
+                'foo.bar.{}.pyc'.format(sys.implementation.cache_tag)))
         with open(weird_path, 'w') as file:
             file.write('x = 123\n')
         py_compile.compile(weird_path)
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