Fix a scoping issue where an UnboundLocalError was triggered if a
lazy-loaded module was already in sys.modules.
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@ -1,6 +1,8 @@
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import importlib
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from importlib import abc
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from importlib import util
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import sys
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import types
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import unittest
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from . import util as test_util
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@ -122,10 +124,18 @@ class LazyLoaderTests(unittest.TestCase):
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self.assertFalse(hasattr(module, '__name__'))
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def test_module_substitution_error(self):
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source_code = 'import sys; sys.modules[__name__] = 42'
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module = self.new_module(source_code)
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with test_util.uncache(TestingImporter.module_name):
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with self.assertRaises(ValueError):
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fresh_module = types.ModuleType(TestingImporter.module_name)
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sys.modules[TestingImporter.module_name] = fresh_module
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module = self.new_module()
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with self.assertRaisesRegex(ValueError, "substituted"):
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module.__name__
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def test_module_already_in_sys(self):
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with test_util.uncache(TestingImporter.module_name):
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module = self.new_module()
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sys.modules[TestingImporter.module_name] = module
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# Force the load; just care that no exception is raised.
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module.__name__
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@ -13,6 +13,10 @@ Core and Builtins
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Library
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-------
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- Fix a scoping issue in importlib.util.LazyLoader which triggered an
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UnboundLocalError when lazy-loading a module that was already put into
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sys.modules.
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- Issue #27079: Fixed curses.ascii functions isblank(), iscntrl() and ispunct().
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- Issue #26754: Some functions (compile() etc) accepted a filename argument
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