Mention ensurepip in package installation docs

[ncoghlan]

BPO	30964
Nosy	@ncoghlan, @NicholasKobald, @dignissimus
PRs	bpo-30964: Mention ensurepip in package installation docs #2786 bpo-30964: [3.6] Backport of 'Mention ensurepip in package installation docs' #2792 bpo-30964: [2.7] Backport of 'Mention ensurepip in package installation docs' #2793 [2.7] bpo-30964: Mention ensurepip in package installation docs (GH-2… #2795 [3.6] bpo-30964: Mention ensurepip in package installation docs (GH-2… #2797

^{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 2018-09-25.20:08:02.144>
created_at = <Date 2017-07-19.00:48:01.677>
labels = ['easy', 'type-feature', '3.7', 'docs']
title = 'Mention ensurepip in package installation docs'
updated_at = <Date 2022-04-03.18:37:40.393>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2022-04-03.18:37:40.393>
actor = 'sam_ezeh'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-09-25.20:08:02.144>
closer = 'brett.cannon'
components = ['Documentation']
creation = <Date 2017-07-19.00:48:01.677>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 30964
keywords = ['easy']
message_count = 7.0
messages = ['298622', '298742', '298765', '298772', '298773', '298774', '298778']
nosy_count = 4.0
nosy_names = ['ncoghlan', 'docs@python', 'Nickk', 'sam_ezeh']
pr_nums = ['2786', '2792', '2793', '2795', '2797']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue30964'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7']

[ncoghlan]

The package installation docs at https://github.com/python/cpython/blob/master/Doc/installing/index.rst have a section on "Common Installation Issues": https://docs.python.org/3/installing/#common-installation-issues

A new entry should be added to this section to cover the case where pip isn't installed by default (e.g. because it was deselected when running the installer), and to suggest trying "python -m ensurepip --default-pip" as a potential remedy.

[NicholasKobald]

Should this section refer to https://packaging.python.org/tutorials/installing-packages/#install-pip-setuptools-and-wheel as well?

[ncoghlan]

New changeset b3527bf by Nick Coghlan (Nicholas) in branch 'master':
bpo-30964: Mention ensurepip in package installation docs (GH-2786)
b3527bf

[ncoghlan]

New changeset 82a77d3 by Nick Coghlan (Nicholas) in branch '2.7':
[2.7] bpo-30964: Mention ensurepip in package installation docs (GH-2795)
82a77d3

[ncoghlan]

New changeset df5837b by Nick Coghlan (Nicholas) in branch '3.6':
[3.6] bpo-30964: Mention ensurepip in package installation docs (GH-2797)
df5837b

[ncoghlan]

Thanks for the contribution & backports!

[NicholasKobald]

No problem! thanks for the help.