[issue31862] Port the standard library to PEP 489 multiphase initialization

[STINNER Victor]

STINNER Victor  added the comment:

I prefer to track the work in a single issue. Even if bpo-1635741 contains many 
unrelated changes, I prefer to continue to use bpo-1635741 to track the work on 
"porting the standard library to PEP 489 multiphase initialization".

--
resolution:  -> duplicate
stage: patch review -> resolved
status: open -> closed
superseder:  -> Py_Finalize() doesn't clear all Python objects at exit

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[STINNER Victor]

STINNER Victor  added the comment:

I marked bpo-15681 "PEP 3121 refactoring applied to binascii module" as a 
duplicate of this issue.

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nosy: +vstinner

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[STINNER Victor]

STINNER Victor  added the comment:

See also bpo-1635741 "Py_Finalize() doesn't clear all Python objects at exit": 
many extension modules have been ported to multi-phase initialization API (PEP 
489) there.

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[Mariatta]

Change by Mariatta :


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pull_requests:  -13420

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[Sergey Fedoseev]

Change by Sergey Fedoseev :


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pull_requests: +13420

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[Petr Viktorin]

Petr Viktorin  added the comment:


New changeset 33e71e01e95506cf8d93fd68251fc56352bc7b39 by Petr Viktorin (Marcel 
Plch) in branch 'master':
bpo-31862: Port binascii to PEP 489 multiphase initialization (GH-4108)
https://github.com/python/cpython/commit/33e71e01e95506cf8d93fd68251fc56352bc7b39


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[issue31862] Port the standard library to PEP 489 multiphase initialization

[Marcel Plch]

Change by Marcel Plch :


--
keywords: +patch
pull_requests: +4078
stage:  -> patch review

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[Petr Viktorin]

Petr Viktorin  added the comment:

FWIW, Marcel is an intern in my team, tasked to learn CPython internals by 
trying to improve subinterpreter support. If I don't comment on his issues it's 
because we discussed privately beforehand.

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[issue31862] Port the standard library to PEP 489 multiphase initialization

[Marcel Plch]

New submission from Marcel Plch :

PEP 489 introduced multiphase initialization of extension and built-in modules.
Now, almost no module in the standard library supports this feature. This 
should be improved to prepare Python for better testing of subinterpreters.

Many benefits of PEP 489 don't apply to stdlib modules. However, the PEP 
effectively says that by using multi-phase init, the module author "promises" 
that the module is "subinterpreter-friendly" [0]. So, when porting, each module 
should be checked that it e.g. doesn't use mutable process-global state.

I'd like to port stdlib to multi-phase init, starting with the easier modules, 
to:
- get familiar with contributing to CPython,
- check and track which modules are already "subinterpreter-friendly", and
- figure out how and where PEP 489 is lacking (beyond what is discussed in 
the PEP itself).


[0]: 
https://www.python.org/dev/peps/pep-0489/#subinterpreters-and-interpreter-reloading

--
components: Extension Modules
messages: 304914
nosy: Dormouse759, encukou, ncoghlan
priority: normal
severity: normal
status: open
title: Port the standard library to PEP 489 multiphase initialization
type: enhancement
versions: Python 3.7

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