Polish whatsnew for 3.8

[rhettinger]

BPO	37759
Nosy	@rhettinger, @vstinner, @ambv, @primal100
PRs	bpo-37759: Significant edits to Whatsnew 3.8 #15127 [3.8] bpo-37759: First round of major edits to Whatsnew 3.8 (GH-15127) #15139 bpo-37759: Second round of edits to Whatsnew 3.8 #15204 [3.8] bpo-37759: Second round of edits to Whatsnew 3.8 (GH-15204) #15240 bpo-37759: Second round of edits to Whatsnew 3.8 (GH-15204) GH-15240 #15241 bpo-37759: Add examples for the new typing features #16763 [3.8] bpo-37759: Add examples for the new typing features (GH-16763) #16764 bpo-37759: Polish What's New in Python 3.8. #16769 [3.8] bpo-37759: Polish What's New in Python 3.8. (GH-16769) #16777 bpo-37759: Remove draft status. Add asyncio REPL example #16785 [3.8]bpo-37759: Remove draft status. Add asyncio REPL example (GH-16785) #16786 bpo-37759: More updates to Whatsnew 3.8 #16854 [3.8] bpo-37759: More updates to Whatsnew 3.8 (GH-16854) #16867 bpo-37759: Show output from var_access_benchmark #17040 [3.8] bpo-37759: Show output from var_access_benchmark (GH-17040) #17041

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/rhettinger'
closed_at = <Date 2019-11-12.05:37:25.904>
created_at = <Date 2019-08-05.02:19:51.545>
labels = ['3.8', 'docs']
title = 'Polish whatsnew for 3.8'
updated_at = <Date 2019-11-12.05:37:25.903>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2019-11-12.05:37:25.903>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2019-11-12.05:37:25.904>
closer = 'rhettinger'
components = ['Documentation']
creation = <Date 2019-08-05.02:19:51.545>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 37759
keywords = ['patch']
message_count = 16.0
messages = ['349018', '349068', '349082', '349503', '349511', '354620', '354621', '354622', '354630', '354631', '354713', '355011', '355012', '355020', '355924', '355925']
nosy_count = 4.0
nosy_names = ['rhettinger', 'vstinner', 'lukasz.langa', 'primal']
pr_nums = ['15127', '15139', '15204', '15240', '15241', '16763', '16764', '16769', '16777', '16785', '16786', '16854', '16867', '17040', '17041']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37759'
versions = ['Python 3.8']

[rhettinger]

Beginning significant edits to whatsnew, adding examples and motivations, improving organization and clarity.

Work in progress.

[rhettinger]

New changeset 4f9ffc9 by Raymond Hettinger in branch 'master':
bpo-37759: First round of major edits to Whatsnew 3.8 (GH-15127)
4f9ffc9

[rhettinger]

New changeset 26f91db by Raymond Hettinger (Miss Islington (bot)) in branch '3.8':
bpo-37759: First round of major edits to Whatsnew 3.8 (GH-15127) (GH-15139)
26f91db

[rhettinger]

New changeset 66a34d3 by Raymond Hettinger in branch 'master':
bpo-37759: Second round of edits to Whatsnew 3.8 (GH-15204)
66a34d3

[rhettinger]

New changeset 9bedb8c by Raymond Hettinger in branch '3.8':
bpo-37759: Second round of edits to Whatsnew 3.8 (GH-15204) (GH-15240)
9bedb8c

[rhettinger]

New changeset a329153 by Raymond Hettinger in branch 'master':
bpo-37759: Add examples for the new typing features (GH-16763)
a329153

[rhettinger]

New changeset 3ac1529 by Raymond Hettinger (Miss Islington (bot)) in branch '3.8':
bpo-37759: Add examples for the new typing features (GH-16763) (GH-16764)
3ac1529

[primal100]

Should singledispatchmethod and cached_property be added?

[ambv]

New changeset 298439c by Łukasz Langa (Serhiy Storchaka) in branch 'master':
bpo-37759: Polish What's New in Python 3.8. (bpo-16769)
298439c

[ambv]

New changeset e498329 by Łukasz Langa in branch '3.8':
[3.8] bpo-37759: Polish What's New in Python 3.8. (GH-16769) (bpo-16777)
e498329

[vstinner]

What's New in Python 3.8:

• functools.singledispatchmethod is missing
  https://docs.python.org/dev/library/functools.html#functools.singledispatchmethod

• About "Added new multiprocessing.shared_memory module. (Contributed by Davin Potts in bpo-35813.)". Comment on Hacker News: "Hard to understand why this is so far down. This is fantastic news!" and "Shared Memory is the star of this release IMHO." I agree with that :-)

• Maybe PYTHONCACHEPREFIX should be better highlighted? "Anyone else most excited about PYTHONCACHEPREFIX? :-P" and "Not sure about most excited, but I am looking forward to setting PYTHONCACHEPREFIX to a location that isn't in a volume mounted into my Docker container for development."

[rhettinger]

New changeset c93883c by Raymond Hettinger in branch 'master':
bpo-37759: More updates to Whatsnew 3.8 (GH-16854)
c93883c

[rhettinger]

New changeset c39bc5c by Raymond Hettinger (Miss Islington (bot)) in branch '3.8':
bpo-37759: More updates to Whatsnew 3.8 (GH-16854) (GH-16867)
c39bc5c

[rhettinger]

Todos for the next round:

• consider an entry for argparse's extend option
• example for multiprocessing shared memory
• Move C major API changes to its own section
• Edit-out very minor changes so that the
  bigger wins are more salient

[rhettinger]

New changeset 1cdadf4 by Raymond Hettinger in branch 'master':
bpo-37759: Show output from var_access_benchmark (GH-17040)
1cdadf4

[rhettinger]

New changeset f90e0d2 by Raymond Hettinger (Miss Skeleton (bot)) in branch '3.8':
bpo-37759: Show output from var_access_benchmark (GH-17040) (GH-17041)
f90e0d2