Python⇒Speed: When to switch to Python 3.9

Python 3.9 is now available–but should you switch to it immediately? And if not now, when?

The short answer is, no, you probably don’t want to switch immediately; quite possibly you can’t switch immediately. To understand why, we need to consider Python packaging, the software development process, and take a look at the history of past releases.

We can then make a guess about when Python 3.9 will actually be usable.

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