The first RC release of SQLAlchemy 2.0 has been released.

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SQLAlchemy is a Python SQL toolkit and database object mapping (ORM) framework. It contains a complete set of enterprise-level persistence patterns designed for efficient and high-performance database access.

The release announcement reads that SQLAlchemy 2.0.0rc1 is very close to the official release of 2.0.0, which is expected to be released in January. This release adds some additional changes since the 2.0.0b4 release, mainly in session behavior.

Also, users of SQLAlchemy 1.4 should ensure that their production requirements.txt files are restricted to the 1.4 series so that the final 2.0.0 release does not cause sudden changes due to accidental upgrades; upgrading from 1.4.x to 2.0.x should always Test even though the full migration steps for the 1.4 series have been done.

2.0 aims toAdapted to practical use in modern Python, the development team spent more than three years upgrading the SQLAlchemy use-case model and architecture. They state that three main Python paradigms have emerged since the first release of SQLAlchemy in 2006:Python 3, pep-484 type support and asyncio.this time SQLAlchemy The 2.0 update ofis to adapt to the constant changes in the Python community. And the Python community is larger than it was 16 years ago, with more new developers who have higher standards for rigor, ease of use, and documentation.

Finally, SQLAlchemy 2.0 is scheduled for a final release in mid-January 2023.

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