Remove base64.encodestring() and base64.decodestring() aliases, deprecated since Python 3.1

[vstinner]

BPO	39351
Nosy	@vstinner
PRs	bpo-39351: Remove base64.encodestring() #18022

^{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 2020-01-16.09:24:34.194>
created_at = <Date 2020-01-16.08:25:17.167>
labels = ['library', '3.9']
title = 'Remove base64.encodestring() and base64.decodestring() aliases, deprecated since Python 3.1'
updated_at = <Date 2020-01-16.09:24:34.193>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2020-01-16.09:24:34.193>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-01-16.09:24:34.194>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2020-01-16.08:25:17.167>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 39351
keywords = ['patch']
message_count = 3.0
messages = ['360096', '360097', '360102']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['18022']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39351'
versions = ['Python 3.9']

[vstinner]

base64.encodestring() and base64.decodestring() are aliases deprecated since Python 3.1: encodebytes() and decodebytes() should be used instead.

In Python 3, "string" means Unicode, whereas these functions really work at the bytes level:

>>> base64.encodestring("text")
TypeError: expected bytes-like object, not str

>>> base64.decodestring("text")
TypeError: expected bytes-like object, not str

encodebytes() and decodebytes() names are explicit on the expected types (bytes or bytes-like).

This issue is similar to bpo-38916: "Remove array.fromstring() and array.tostring() aliases, deprecated since Python 3.2".

Attached PR removes the deprecated aliases base64.encodestring() and base64.decodestring().

[vstinner]

The deprecation was introduced 11 years ago in bpo-3613 by this change:

commit b54d801
Author: Georg Brandl <georg@python.org>
Date: Thu Jun 4 09:11:51 2009 +0000

bpo-3613: add base64.encodebytes and decodebytes as the new spelling of encodestring and decodestring; deprecate the latter.

The aliases were deprecated for 7 cycles (Python 3.1 to Python 3.8).

[vstinner]

New changeset 210c19e by Victor Stinner in branch 'master':
bpo-39351: Remove base64.encodestring() (GH-18022)
210c19e