Functional Programming HOWTO: Dictionary ordering isn't "essentially random"

[Stigjb]

BPO	34083
Nosy	@rhettinger, @methane, @miss-islington, @Stigjb
PRs	bpo-34083: Update dict order in Functional HOWTO #8230 [3.7] bpo-34083: Update dict order in Functional HOWTO (GH-8230) #8246

^{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 2018-07-11.09:59:37.147>
created_at = <Date 2018-07-10.10:17:05.224>
labels = ['3.7', '3.8', 'docs']
title = 'Functional Programming HOWTO: Dictionary ordering isn\'t "essentially random"'
updated_at = <Date 2018-07-11.11:21:54.613>
user = 'https://github.com/Stigjb'

bugs.python.org fields:

activity = <Date 2018-07-11.11:21:54.613>
actor = 'miss-islington'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2018-07-11.09:59:37.147>
closer = 'methane'
components = ['Documentation']
creation = <Date 2018-07-10.10:17:05.224>
creator = 'Stig Johan Berggren'
dependencies = []
files = []
hgrepos = []
issue_num = 34083
keywords = ['patch']
message_count = 6.0
messages = ['321375', '321386', '321389', '321427', '321428', '321445']
nosy_count = 5.0
nosy_names = ['rhettinger', 'methane', 'docs@python', 'miss-islington', 'Stig Johan Berggren']
pr_nums = ['8230', '8246']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34083'
versions = ['Python 3.7', 'Python 3.8']

[Stigjb]

The section about iterators in the Functional Programming HOWTO (https://docs.python.org/3/howto/functional.html#data-types-that-support-iterators) states the following about looping over dictionary keys:

"Note that the order is essentially random, because it’s based on the hash ordering of the objects in the dictionary."

Starting with 3.7, dictionary order is guaranteed to be the same as insertion order.

[rhettinger]

Thanks for noticing this. Do you want to contribute a patch or would you like me to just fix it up?

[Stigjb]

I'll try to patch it myself.

[methane]

New changeset 5e5bbbe by INADA Naoki (Stig Johan Berggren) in branch 'master':
bpo-34083: Update dict order in Functional HOWTO (GH-8230)
5e5bbbe

[methane]

Thanks, Stig.
And I'm sorry about I missed Raymond assigned himself.

[miss-islington]

New changeset 151820e by Miss Islington (bot) in branch '3.7':
bpo-34083: Update dict order in Functional HOWTO (GH-8230)
151820e