tests still rely on the removed stdlib modules asyncore/asynchat

Reference: PEP 594 – Removing dead batteries from the standard library.

This issue tracks removal of the following modules:

Demote from the public API into the test helpers
- smtpd (gh-93243: Make smtpd private before porting its users #93246)
- asynchat and asyncore (gh-72719: Remove deprecated asyncore and asynchat modules #96580)
Port tests onto relevant analogs, step by step
- smtpd
  - test.test_smtplib
- asynchat and asyncore
  - test.test_ftplib
  - test.test_logging
  - test.test_poplib
    - try to give priority for gh-74699: test_pop3lib asyncore with asyncio #1864
  - test.test_smtplib
  - test.test_ssl
  - test.libregrtest.save_env
Remove the remnescants
- Lib/test/smtpd.py, PCbuild/*
- Lib/test/support/async(hat|ore).py, PCbuild/*
- Dead links from What's New and release notes

Related issues:

Remove asyncore, asynchat and smtpd modules #72719 (created 3 years before PEP 594 was written)
Update tests from asyncore to asyncio #91171 (I lost authorship there during the porting from the bugs.python.org)

This requires finishing #1864 (which I need to get back to).

Asyncore-based test servers from test_ftp and test_logging cannot be ported to asyncio, the tested clients are blocking. However, instead of writing a server thread class from scratch, it would be nice to reuse test.support.threading_helper.Server from gh-92475.

gh-93243: Make smtpd private before porting its users (GH-93246)

pythongh-93243: Make smtpd private before porting its users (pythonGH…

Changing the title to reflect what still needs to be done.

PEP 594 has been fully implemented: asyncore, asynchat and smtpd have been removed from the stdlib.

Some tests still use asyncore, asynchat and smtpd: there is now a copy in Lib/test/support/ only for tests. While it would be nice to rewrite these tests using asyncio or threads, it seems like no one is interested to work on that.

I suggest to close the issue as "not planned". It's ok to leave tests are they are, since tests are now reliable and stable.

I agree.

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tests still rely on the removed stdlib modules asyncore/asynchat #93243

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tests still rely on the removed stdlib modules asyncore/asynchat #93243

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JelleZijlstra commented on May 26, 2022

arhadthedev commented on Jul 12, 2022

iritkatriel commented on Nov 29, 2023

vstinner commented on Feb 27, 2025

iritkatriel commented on Feb 27, 2025

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