Using Python 3.10, but Pylance still says "Alternative syntax for unions requires Python 3.10 or newer"

Question

I just upgraded Python to 3.10 for the new features, and when I do import sys; sys.version using the IPython console in VS Code, it prints Python version 3.10.0. But when I open an editor window and try to enter a type annotation using | for sum types, e.g. x:int|float, Pylance highlights the | and says "Alternative syntax for unions requires Python 3.10 or newer."

Any thoughts?

Answer 1

VS Code may be using a different version of python. Make sure that the default python interpreter (under settings, search for python) is python3.10 (if you are using linux, /usr/bin/python3.10 will probably work)

Answer 2

For me the solution was to use "python3" in "Default Interpreter Path". In my case, I noticed that terminal didn't recognize the command "python", but there was "python3" command, which comes with Python v3 and up. So I changed the path to that and I didn't get any errors anymore.