apply pyupgrade

[Borda]

Description

Update Python notation to be better suitable to python 3.6+
in fact, I have just used the pyupgrade nook in pre-commit

Status

Ready/Work in progress/Hold

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[wyli]

I guess the goal is to do this kind of commit automatically in the future, not sure whether it is compatible with the other code formatting tools. But the current changes look good. We can experiment it with the development branch for a while first

[Borda]

not sure whether it is compatible with the other code formatting tools

it shall be and another case it shall be caught by your CI :]

[wyli]

/integration-test
/black

[wyli]

It looks good to me, thanks!