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bpo-42064: Adapt `sqlite3` to multi-phase init (PEP 489) by erlend-aasland · Pull Request #29234 · python/cpython

$ cat measure.py
import gc
import sys

for _ in range(5):
    gc.collect()
    before = sys.gettotalrefcount()

    import sqlite3
    del sys.modules['sqlite3']
    del sqlite3

    gc.collect()
    after = sys.gettotalrefcount()

    print(f"{before=}, {after=}")

$ ./python.exe measure.py
before=51469, after=66883
before=66892, after=66892
before=66892, after=66892
before=66892, after=66892
before=66892, after=66892

Thank you so much for helping reviewing and improving this, @corona10, @vstinner, @encukou!

For a list of PR's:
$ git log --grep "bpo-\(42064\|41861\|40956\|42862\)" --oneline