Update collections ABC table to match the __abstractmethods__ attribute for each container.
Issue 17538: Document XML vulnerabilties
Fix XML vulnerability link targets.
Fix typos and clear up one very odd bit of wording as pointed out by
Ezio.
fall back when an old test_support doesn't have various data and functions (closes #17533)
merge 2.7.4 release branch
G -> M (closes #17533)
merge 2.7.4 release branch
Issue #17390: Display Python version on Idle title bar. Patch by Edmond Burnett.
#6649: Fixed missing exit status in IDLE. Patch by Guilherme Polo.
Add an itertools recipe showing how to use t.__copy__().