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Issue #14605: Use None in sys.path_importer_cache to represent no

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finder instead of using some (now non-existent) implicit finder.
This commit is contained in:
Brett Cannon 2012-04-27 15:30:58 -04:00
parent 9e66ac683c
commit aa93642a35
7 changed files with 1096 additions and 1172 deletions
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28
Lib/importlib/test/import_/test_path.py
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@ -66,36 +66,18 @@ def test_path_hooks(self):
self.assertTrue(sys.path_importer_cache[path] is importer)
def test_empty_path_hooks(self):
# Test that if sys.path_hooks is empty a warning is raised and
# PathFinder returns None.
# tried again (with a warning).
# Test that if sys.path_hooks is empty a warning is raised,
# sys.path_importer_cache gets None set, and PathFinder returns None.
path_entry = 'bogus_path'
with util.import_state(path_importer_cache={}, path_hooks=[],
path=['bogus_path']):
path=[path_entry]):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
self.assertIsNone(machinery.PathFinder.find_module('os'))
self.assertNotIn('os', sys.path_importer_cache)
self.assertIsNone(sys.path_importer_cache[path_entry])
self.assertEqual(len(w), 1)
self.assertTrue(issubclass(w[-1].category, ImportWarning))
def test_path_importer_cache_has_None_continues(self):
# Test that having None in sys.path_importer_cache causes the search to
# continue.
path = '<test path>'
module = '<test module>'
importer = util.mock_modules(module)
with util.import_state(path=['1', '2'],
path_importer_cache={'1': None, '2': importer},
path_hooks=[imp.NullImporter]):
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter('always')
loader = machinery.PathFinder.find_module(module)
self.assertTrue(loader is importer)
self.assertEqual(len(w), 1)
warned = w[0]
self.assertTrue(issubclass(warned.category, ImportWarning))
self.assertIn(repr(None), str(warned.message))
def test_path_importer_cache_empty_string(self):
# The empty string should create a finder using the cwd.
path = ''