gh-117398: gh-119655: datetime: Init static state once & don't free it

[encukou]

• While datetime uses global state, only initialize it once.
• While capi is static, don't free it (thanks @neonene in https://github.com/python/cpython/pull/119641/files#r1616710048)

• Issue: Isolate the _datetime extension module #117398

[vstinner]

It's not correct to free capi here?

[encukou]

capi is static, we should not free it.

[ericsnowcurrently]

LGTM

[ericsnowcurrently]

typo:

    // (capsule == NULL) is handled by PyModule_Add.

[ericsnowcurrently]

I'll take care of backporting this to 3.13 (by adding it into gh-119641).

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD 3.x has failed when building commit a89fc26.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/1223/builds/3218) and take a look at the build logs.
4. Check if the failure is related to this commit (a89fc26) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/1223/builds/3218

Failed tests:

• test_ssl

Failed subtests:

• test_get_server_certificate_ipv6 - test.test_ssl.NetworkedTests.test_get_server_certificate_ipv6

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/test/test_ssl.py", line 2225, in test_get_server_certificate_ipv6
    _test_get_server_certificate(self, 'ipv6.google.com', 443)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/test/test_ssl.py", line 2230, in _test_get_server_certificate
    pem = ssl.get_server_certificate((host, port))
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/ssl.py", line 1514, in get_server_certificate
    with create_connection(addr, timeout=timeout) as sock:
         ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/socket.py", line 828, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
               ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/buildbot/buildarea/3.x.ware-freebsd/build/Lib/socket.py", line 963, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
               ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
socket.gaierror: [Errno 1] Address family for hostname not supported

[erlend-aasland]

Thanks!