multiprocessing: enhance repr() to ease debugging

[vstinner]

BPO	35491
Nosy	@vstinner
PRs	bpo-35491: Enhance multiprocessing.BaseProcess.__repr__() #11138 bpo-35491, multiprocessing: replace "RUN" with RUN #11178

^{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 2018-12-14.11:59:08.436>
created_at = <Date 2018-12-14.11:10:02.288>
labels = ['3.8', 'library']
title = 'multiprocessing: enhance repr() to ease debugging'
updated_at = <Date 2018-12-16.22:40:51.970>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2018-12-16.22:40:51.970>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-12-14.11:59:08.436>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2018-12-14.11:10:02.288>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 35491
keywords = ['patch']
message_count = 3.0
messages = ['331795', '331806', '331941']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['11138', '11178']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35491'
versions = ['Python 3.8']

[vstinner]

multiprocessing.Pool has no __repr__() method, multiprocessing.BaseProcess.__repr__() doesn't contain the pid.

I propose to enhance repr() in the multiprocessing module to ease debug.

commit 2b417fb (HEAD -> master, upstream/master)
Author: Victor Stinner <vstinner@redhat.com>
Date: Fri Dec 14 11:13:18 2018 +0100

Add multiprocessing.Pool.__repr__() (GH-11137)

* Add multiprocessing.Pool.__repr__() to ease debug
* RUN, CLOSE and TERMINATE constants values are now strings rather
  than integer to ease debug

[vstinner]

New changeset 7acd50a by Victor Stinner in branch 'master':
bpo-35491: Enhance multiprocessing.BaseProcess.__repr__() (GH-11138)
7acd50a

[vstinner]

New changeset 2dfe351 by Victor Stinner in branch 'master':
bpo-35491, multiprocessing: replace "RUN" with RUN (GH-11178)
2dfe351