Add pyupgrade

[stinodego]

Relates to #4044

I made a PR recently where I used pyupgrade to upgrade the type hints and some other small things. Now I am adding it to the CI to make sure we stay compliant (a few 'old' language features already snuck in in the meantime...).

Changes:

• Added pyupgrade - Makes sure to use that we're using the latest language features.
  • Added to CI
  • Added to make pre-commit command
• Ran pyupgrade
• Moved Expr.list to the bottom of the class definition, in order not to confuse mypy

[ritchie46]

Looks good to me. So that would mean we should run python 3.7 locally right?

[stinodego]

Looks good to me. So that would mean we should run python 3.7 locally right?

No reason to run Python 3.7 locally - it's just making sure you are no longer using language features that have a better alternative in Python version 3.7 or earlier.

For example, f-strings became available in Python 3.6. If you're using an older way of formatting strings (e.g. percentage sign or .format()), it will be upgraded to an f-string. This is safe, because our package depends on Python 3.7 or higher.

I run Python 3.10 myself 😄

[ritchie46]

Right.. great addition then! :)