test_attribute_completion fails because of a lazy internal import

[serhiy-storchaka]

Bug report

Reader.run_hooks() imports _pyrepl._threading_handler on the first call if threading is already imported.

TestPyReplModuleCompleter.test_attribute_completion collects the modules imported while the reader runs and compares them with the modules the completer is expected to import, so all 17 subtests fail:

AssertionError: Items in the first set but not the second:
'_pyrepl._threading_handler'

./python -m unittest test.test_pyrepl.test_pyrepl.TestPyReplModuleCompleter.test_attribute_completion

Importing _pyrepl._threading_handler before running the test makes it pass.

Linked PRs

• gh-155727: Ignore internal imports in test_attribute_completion #155730
• [3.15] gh-155727: Ignore internal imports in test_attribute_completion (GH-155730) #155769