Update collections ABC table to match the __abstractmethods__ attribute for each container.
Issue 17538: Document XML vulnerabilties
Fix XML vulnerability link targets.
#17564: skip test_bad_address unless the tests are run with -unetwork/-uall.
#17526: fix an IndexError raised while passing code without filename to inspect.findsource().  Initial patch by Tyler Doyle.
Fix typos and clear up one very odd bit of wording as pointed out by
Ezio.
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