Python 3.8, 3.9 or 3.10 for new projects?

[craigburmr]

Basically, I deploy on Ubuntu server 20.04 which ships with python 3.8. I developed Python apps using Linux/macOS. Currently, it's 3.9 on macOS. How to Downgrade Python 3.10 to 3.9 was just released days ago and claimed to be 10% faster than Python 3.9. (I use the Python framework Django/Flask/Tornado mostly)

Which version for a new project is better and why? Thanks

 

[brass9]

I'm sticking with 3.9 for time being. Not going to use any incompatible syntax/language constructs in my apps for the next 3 years. In my humble experience, backwards compatibility is far more important than using nice syntactic sugars du jour... especially if you'll have to revisit and support an app after a few years...

Get a list of installed python binaries:

ls /usr/bin/python*

Then set the alias in your .zsrhrc/.bashrc profile:

alias python3=python3.9

Alternatively, you can use update-alternatives to choose the version you want...

create the alternatives:

# sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.9 1
# sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.10 2

Then choose the version:

# sudo update-alternatives --config python3