Update code to increment and decrement using the cleaner += 1 and -= 1 style.
Issue #17385: Fix quadratic behavior in threading.Condition
Improve variable names
#11963: remove human verification from test_parser and test_subprocess.
#11963: merge with 3.2.
#11963: merge with 3.3.
Issue #15806: Add contextlib.ignored().
Remove debug print.
#17351: remove "object" inheritance from docs.  Patch by Phil Elson.
#17351: merge with 3.2.
#17351: merge with 3.3.
remove useless words (#17327)
remove more useless words
say defaultobj is returned (#17327)
fix spelling (#17327)
#17395: wait for live children in test_multiprocessing.
Issue #17047: removed doubled words in Doc/*, Mac/*, and Tool/*
found by Serhiy Storchaka and Matthew Barnett
Merge with 3.2: Issue #17047: removed doubled words in Doc/*,
Mac/*, and Tool/* found by Serhiy Storchaka and Matthew Barnett
Merge with 3.3: Issue #17047: removed doubled words in Doc/*,
Mac/*, and Tool/* found by Serhiy Storchaka and Matthew Barnett
Issue #17047: remove doubled words found in 2.7 to 3.4 Modules/*,
as reported by Serhiy Storchaka and Matthew Barnett.