Thanks to Chris Jerdonek

Thanks to Chris Jerdonek

Issue #15630: Add an example for "continue" statement in the tutorial. Patch by
Daniel Ellis.

Daniel Ellis.

set.

Patch by Serhiy Storchaka.

Patch by Serhiy Storchaka.

Patch by Serhiy Storchaka.

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.