Update Python to 3.10.x

[slel]

Python 3.10 was released 2021-10-04, the current version is 3.10.2, released 2022-01-14.

Upstream PR:

• [3.10] bpo-46025: Fix a crash in the atexit module for auto-unregistering functions (GH-30002) python/cpython#30005

To test, use:

./configure --without-system-python3 --enable-download-from-upstream-url

Necessary changes to the library should go on #30766 (Support Python 3.10)

Related:

• PEP 619 -- Python 3.10 Release Schedule
• What's new in Python 3.10
• Experimental support for Python 3.10 in Sage 9.5 #30766: Support Python 3.10
• Upgrade Python to 3.9.1, pip to 20.3.3 #30589: Test ticket: Python 3.9.0
• Adopt the “time window-based” policy for support of Python versions from NEP 29 #30384: Adopt the “time window-based” policy for support of Python versions from NEP 29

Depends on #33055

CC: @mkoeppe @slel @embray @dimpase @kiwifb @antonio-rojas @isuruf

Component: packages: standard

Keywords: upgrade, python

Author: Matthias Koeppe

Branch/Commit: 95e3784

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/30767

[slel]

comment:1

Python 3.10.0a1 was released on 2020-10-05.

• https://www.python.org/downloads/release/python-3100a1/

[slel]

Description changed:

--- 
+++ 
@@ -1 +1,23 @@
+This is to test building Sage using Python 3.10.
+Python 3.10.0 expected release: 2021-10-04.
 
+This upgrades to a Python 3.10.0 development release for testing ticket #30766 (Support Python 3.10).
+
+It is not intended for merging -- we should stay on 3.8 and then 3.9 for a while.
+
+To test, use:
+
+```
+./configure --without-system-python3 --enable-download-from-upstream-url
+```
+
+Necessary changes to the library should go on #30766 (Support Python 3.10).
+
+Related:
+
+- [PEP 619 -- Python 3.10 Release Schedule](https://www.python.org/dev/peps/pep-0619/)
+- [What's new in Python 3.10](https://docs.python.org/3.10/whatsnew/3.10.html)
+- #30766: Support Python 3.10
+- #30589: Test ticket: Python 3.9.0
+- #30384: Adopt the “time window-based” policy for support of Python versions from NEP 29
+

[slel]

Changed keywords from none to upgrade, python

[slel]

Dependencies: #30768

[slel]

comment:3

Python 3.10.0a7 was released on 2021-04-05.

• Python 3.10.0a7
• announcement on python-announce

The next pre-release of Python 3.10 will be 3.10.0b1
(the first beta release and feature freeze),
currently scheduled for Monday, 2021-05-03.

[mkoeppe]

Description changed:

--- 
+++ 
@@ -1,9 +1,11 @@
 This is to test building Sage using Python 3.10.
 Python 3.10.0 expected release: 2021-10-04.
 
+3.10.0b1 released 2021-05-11.
+
 This upgrades to a Python 3.10.0 development release for testing ticket #30766 (Support Python 3.10).
 
-It is not intended for merging -- we should stay on 3.8 and then 3.9 for a while.
+It is not intended for merging -- we should stay on 3.9.x for a while.
 
 To test, use:
 

[mkoeppe]

Changed dependencies from #30768 to #30768, #31815

[mkoeppe]

Branch: u/mkoeppe/test_ticket__python_3_10_development_releases

[mkoeppe]

Changed dependencies from #30768, #31815 to #30768, #31815; do not merge

[mkoeppe]

Commit: 86a9807