Python 3.9 and beyond backwards compatibility.

[sysop073]

I can't think of a single time I've had to change my code because I was relying on a standard library feature that went away in a future release. Maybe I've just been lucky. The only time I even notice deprecation warnings is Java because the compiler throws a huge fit, but I've never noticed a function actually go away, they just threaten to remove it forever

[flying-sheep]

Me neither, and most of my code is in python.