Issue 39377: json.loads encoding parameter deprecation removal in Python 3.9

This is a followup of issue33461. The warning says about removal of the encoding parameter in 3.9 . It's already ignored since 3.1 hence I assume this should be raising a TypeError in 3.9 removing the deprecation warning. I am finding some projects using the encoding parameter though it has no effect. Since Python 3.9 has alpha 3 to be released it will be good to fix the deprecation in the early stage of release cycle.

New changeset 5492bfcefec67b016e8239c0e9135bc2f03e3058 by Inada Naoki in branch 'master':
bpo-39377: json: Remove the encoding option. (GH-18075)
https://github.com/python/cpython/commit/5492bfcefec67b016e8239c0e9135bc2f03e3058

Should we be raising an error if encoding is present on 3.9 as part of kwargs? It's obtrusive but for people going from Python 3.7 to 3.9 there will be no change and they will keep assuming encoding parameter is valid.

Do you mean to say we should or shouldn't be raising an error? With Inada-san's change you get this:

>>> json.loads("true", encoding='utf8')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\ammar\workspace\cpython\lib\json\__init__.py", line 359, in loads
    return cls(**kw).decode(s)
TypeError: __init__() got an unexpected keyword argument 'encoding'

If this broke some real-world software and the pain is high enough, we can revert the change and add one more deprecation period, like all other removals.

> Do you mean to say we should or shouldn't be raising an error? With Inada-san's change you get this:

Sorry, I misread the patch as only removal and didn't test the change completely.

I am filing issues on code that I can find using this pattern and will wait for the feedback during alpha cycle.

* https://github.com/ansible/ansible/issues/66592
* https://github.com/jupyter/notebook/issues/5165
* https://github.com/django-extensions/django-extensions/issues/1465

I reopen the issue.

> New changeset 5492bfcefec67b016e8239c0e9135bc2f03e3058 by Inada Naoki in branch 'master':
> bpo-39377: json: Remove the encoding option. (GH-18075)
> https://github.com/python/cpython/commit/5492bfcefec67b016e8239c0e9135bc2f03e3058

Would you mind to document the removal in the following doc section?
https://docs.python.org/dev/whatsnew/3.9.html#removed

Please update the documentation which still mentions the encoding parameter.

New changeset 5bbac8cbdf140ebce446ea4e7db2b20a5d7b8402 by Inada Naoki in branch 'master':
bpo-39377: json: Update doc about the encoding option. (GH-18076)
https://github.com/python/cpython/commit/5bbac8cbdf140ebce446ea4e7db2b20a5d7b8402