$ ./python -m test.regrtest test_inspect test_site Run tests sequentially 0:00:00 load avg: 0.03 [1/2] test_inspect 0:00:00 load avg: 0.03 [2/2] test_site test test_site failed -- Traceback (most recent call last): File "/home/yen/Projects/cpython/Lib/test/test_site.py", line 400, in test_abs_paths_cached_None site.abs_paths() File "/home/yen/Projects/cpython/Lib/site.py", line 101, in abs_paths for m in set(sys.modules.values()): TypeError: unhashable type: 'dict' test_site failed If I run test_inspect or test_site individually, both pass. Full log can be found in the attached file. Environment: Arch Linux x86_64 latest. CPython commit 81574b80e92554adf75c13fa42415beb8be383cb, configured with `./configure`

You can try to limit the number of tests needed to reproduce the bug using: ./python -m test.bisect -n 5 test_inspect test_site

The failing test was added with d4c76d960b8b286b75c933780416ace9cda682fd commit d4c76d960b8b286b75c933780416ace9cda682fd Author: INADA Naoki <methane@users.noreply.github.com> Date: Mon Oct 1 21:10:37 2018 +0900 bpo-30167: Add test for module.__cached__ is None (GH-7617) diff --git a/Lib/test/test_site.py b/Lib/test/test_site.py index dc59e5917c..33a8f1a44c 100644 --- a/Lib/test/test_site.py +++ b/Lib/test/test_site.py @@ -389,6 +389,17 @@ class ImportSideEffectTests(unittest.TestCase): "expected absolute path, got {}" .format(os__cached__.decode('ascii'))) + def test_abs_paths_cached_None(self): + """Test for __cached__ is None. + + Regarding to PEP 3147, __cached__ can be None. + + See also: https://bugs.python.org/issue30167 + """ + sys.modules['test'].__cached__ = None + site.abs_paths() + self.assertIsNone(sys.modules['test'].__cached__) + # Latest master ➜ cpython git:(master) ./python.exe -m test.regrtest test_inspect test_site Run tests sequentially 0:00:00 load avg: 1.75 [1/2] test_inspect 0:00:02 load avg: 1.75 [2/2] test_site test test_site failed -- Traceback (most recent call last): File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/test/test_site.py", line 400, in test_abs_paths_cached_None site.abs_paths() File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/site.py", line 101, in abs_paths for m in set(sys.modules.values()): TypeError: unhashable type: 'dict' test_site failed == Tests result: FAILURE == 1 test OK. 1 test failed: test_site Total duration: 2 sec 868 ms Tests result: FAILURE ➜ cpython git:(master) git checkout d4c76d960b8b286b75c933780416ace9cda682fd~1 Lib/test/test_site.py ➜ cpython git:(master) ✗ ./python.exe -m test.regrtest test_inspect test_site Run tests sequentially 0:00:00 load avg: 1.49 [1/2] test_inspect 0:00:02 load avg: 1.49 [2/2] test_site == Tests result: SUCCESS == All 2 tests OK. Total duration: 2 sec 848 ms Tests result: SUCCESS Adding INADA Naoki for thoughts. Thanks

Thanks very much for the test.bisect hint! After some more trials, I guess it's an issue in the `inspect` module rather than the newly-added test in test_site. Here's an example script: import inspect import sys import _testcapi builtin = _testcapi.docstring_with_signature_with_defaults spec = inspect.getfullargspec(builtin) print(type(sys.modules['__builtins__'])) After inspect.getfullargspec(), sys.modules['__builtins__'] is a dict. That's a little bit strange as every other item in sys.modules is a module.

 New changeset c57eb9a336391dc22aa29e9db592fa06d7fb7101 by Miss Islington (bot) (Chih-Hsuan Yen) in branch 'master': bpo-34871: Fix two typos in test_inspect.py (GH-9698) https://github.com/python/cpython/commit/c57eb9a336391dc22aa29e9db592fa06d7fb7101 

 New changeset 6f85b826b527e240551613aeec3118a5469e3a33 by Miss Islington (bot) (INADA Naoki) in branch 'master': bpo-34871: inspect: Don't pollute sys.modules (GH-9696) https://github.com/python/cpython/commit/6f85b826b527e240551613aeec3118a5469e3a33 

 New changeset 70a083bc46aea84e3b3ffca2c10c295917a98fec by Yury Selivanov (Miss Islington (bot)) in branch '3.6': bpo-34871: inspect: Don't pollute sys.modules (GH-9696) (GH-9702) https://github.com/python/cpython/commit/70a083bc46aea84e3b3ffca2c10c295917a98fec 

 New changeset 476c294f260ebe1b44157a168c3dfa4a43724ce3 by Yury Selivanov (Miss Islington (bot)) in branch '3.7': bpo-34871: inspect: Don't pollute sys.modules (GH-9696) (#9701) https://github.com/python/cpython/commit/476c294f260ebe1b44157a168c3dfa4a43724ce3 

Thank you Inada-san for taking care of this.