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Fixed #14698 -- Ensure that module_has_sumodule doesn't mistake a cac…

…he miss for an existent package. Thanks to Łukasz Rekucki for the report and patch, and to shields for the test case.

git-svn-id: bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 56ebab9d8596f63db38053816ec961656e49ed38 1 parent 4392c8e
@freakboy3742 freakboy3742 authored
7 django/utils/
@@ -6,8 +6,11 @@
def module_has_submodule(package, module_name):
"""See if 'module' is in 'package'."""
name = ".".join([package.__name__, module_name])
- if name in sys.modules:
- return True
+ try:
+ # None indicates a cached miss; see mark_miss() in Python/import.c.
+ return sys.modules[name] is not None
+ except KeyError:
+ pass
for finder in sys.meta_path:
if finder.find_module(name):
return True
4 tests/regressiontests/utils/
@@ -25,6 +25,10 @@ def test_loader(self):
self.assertFalse(module_has_submodule(test_module, 'no_such_module'))
self.assertRaises(ImportError, import_module, 'regressiontests.utils.test_module.no_such_module')
+ # Don't be confused by caching of import misses
+ import types # causes attempted import of regressiontests.utils.types
+ self.assertFalse(module_has_submodule(sys.modules['regressiontests.utils'], 'types'))
class EggLoader(unittest.TestCase):
def setUp(self):
self.old_path = sys.path[:]
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