Most bytecode changes are absent from Python 3.9 What's new

[MatthieuDartiailh]

BPO	41703
Nosy	@ned-deily, @ambv, @markshannon, @MatthieuDartiailh, @miss-islington
PRs	bpo-41703: Fix incorrect bpo number in change notes. #22151 [3.9] bpo-41703: Fix incorrect bpo number in change notes. (GH-22151) #22174

^{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/markshannon'
closed_at = <Date 2021-08-13.08:35:10.256>
created_at = <Date 2020-09-03.13:26:53.240>
labels = ['3.9']
title = "Most bytecode changes are absent from Python 3.9 What's new"
updated_at = <Date 2021-08-13.08:35:10.256>
user = 'https://github.com/MatthieuDartiailh'

bugs.python.org fields:

activity = <Date 2021-08-13.08:35:10.256>
actor = 'Mark.Shannon'
assignee = 'Mark.Shannon'
closed = True
closed_date = <Date 2021-08-13.08:35:10.256>
closer = 'Mark.Shannon'
components = []
creation = <Date 2020-09-03.13:26:53.240>
creator = 'mdartiailh'
dependencies = []
files = []
hgrepos = []
issue_num = 41703
keywords = ['patch']
message_count = 6.0
messages = ['376298', '376576', '376582', '376624', '376646', '377725']
nosy_count = 5.0
nosy_names = ['ned.deily', 'lukasz.langa', 'Mark.Shannon', 'mdartiailh', 'miss-islington']
pr_nums = ['22151', '22174']
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41703'
versions = ['Python 3.9']

[MatthieuDartiailh]

A number of bytecodes have been added removed in Python 3.9 as documented in https://docs.python.org/3.9/library/dis.html. However only the addition of LOAD_ASSERTION_ERROR is currently documented in What's New. The relevant bpo issues are:

• https://bugs.python.org/issue33387
• https://bugs.python.org/issue39320

[markshannon]

https://bugs.python.org/issue39320 has a change note:
https://docs.python.org/3.9/whatsnew/changelog.html#python-3-9-0-beta-3

[markshannon]

The change note for 33387 incorrectly referred to 32949

[ned-deily]

Mark, PR 22151 needs to be merged to the 3.9 branch as well. You can add the "Needs backport to 3.9" label to the original PR.

[markshannon]

Thanks for the reminder. Tis' done.

[MatthieuDartiailh]

Looking at the current version of the page https://docs.python.org/3.9/whatsnew/3.9.html#cpython-bytecode-changes I still see only the LOAD_ASSERTION_ERROR. It seems the changelog got updated but not the What's new