Add os.RWF_APPEND flag for os.pwritev

[bezoka]

BPO	37129
Nosy	@terryjreedy, @gpshead, @vstinner, @YoSTEALTH, @csabella, @pablogsal, @bezoka
PRs	bpo-37129: Add os.RWF_APPEND flag for os.pwritev #13735 bpo-37129: Add os.RWF_APPEND flag for os.pwritev #20335 bpo-37129: Add os.RWF_APPEND flag for os.pwritev #20336

^{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 = None
closed_at = <Date 2020-05-28.00:16:52.874>
created_at = <Date 2019-06-01.21:51:52.932>
labels = ['type-feature', 'library', '3.10']
title = 'Add os.RWF_APPEND flag for os.pwritev'
updated_at = <Date 2020-05-28.00:16:52.873>
user = 'https://github.com/bezoka'

bugs.python.org fields:

activity = <Date 2020-05-28.00:16:52.873>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-28.00:16:52.874>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2019-06-01.21:51:52.932>
creator = 'bezoka'
dependencies = []
files = []
hgrepos = []
issue_num = 37129
keywords = ['patch']
message_count = 7.0
messages = ['345000', '345193', '369670', '369690', '369754', '370139', '370156']
nosy_count = 7.0
nosy_names = ['terry.reedy', 'gregory.p.smith', 'vstinner', 'YoSTEALTH', 'cheryl.sabella', 'pablogsal', 'bezoka']
pr_nums = ['13735', '20335', '20336']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37129'
versions = ['Python 3.10']

[terryjreedy]

Issues need a more complete title and at least *some* explanation.

[gpshead]

This is just adding a missing constant (when defined at CPython compile time) to the os module. I suggest landing this in 3.8 as well assuming we're still in the beta cycles when the PR is ready. It isn't a functional change.

[csabella]

The PR for this issue has been closed, but the issue is now open for someone else to make a PR for it. Please credit the original author in the new PR.

[terryjreedy]

YoSTEALTH, are you both allowed and willing to do so? The patch is not completely trivial and you seem to have the needed knowledge. (I don't.)

[YoSTEALTH]

terry.reedy ok, recreated the patch.