Closes #15620: check for presence of readline.clear_history(), which is apparently missing on some readline versions, before calling it in the test.

Patch by Ludwig Hähne.

Patch by Ludwig Hähne.

PyImport_ImportModuleLevel() with a 'level' of 0 instead of -1 as the
latter is no longer a valid value.

Also added a versionchanged note for PyImport_ImportModuleLevel() just
in case people don't make the connection between changes to
__import__() and this C function.

Patch contributed by Daniel Ellis.

module again. Also took the opportunity to stop accidentally exporting
_imp.extension_suffixes() as public.

state of the import system. Also make importlib.invalidate_caches()
work with sys.meta_path instead of sys.path_importer_cache to
completely separate the path-based import system from the overall
import system.

Patch by Eric Snow.

Initial patch by Anton Barkovsky.

Initial patch by Anton Barkovsky.

failure on OS X built with 10.4 ABI.

Restore the errno before calling the previous signal handler, and not after.

that occasionally uses doubles.

different than KeyboardInterrupt

  tools (dpkg-dev) installed.

by building a local copy of libsqlite3 with OS X installers rather than
depending on the wide range of versions supplied with various OS X releases.

data.

Also alphabetized the attributes in the blacklist to make it easier to
detect changes.

Initial patch by Éric Araujo.