Upgrade python base version to python 3.10

[wu-clan]

Discussed in #22

^{Originally posted by downdawn April 25, 2023}

5. Use python3.10 version

The pre-commit configuration specifies version 3.10 by default, and some new features can be used later, of course, compatibility should also be considered

https://fastapi.tiangolo.com/python-types/#newer-versions-of-python

[wu-clan]

I am doing this work based on Python 3.8, but even if I add from __future__ Import annotations, I cannot use the | flag either

[wu-clan]

Because this is not a library, it must pass local code testing, at least >= 3.7 or 3.8

[wu-clan]

Hi, @downdawn

Is it convenient for you to perform the test?

I may lose my coding on May 1st because I don't have a laptop and I can only reply to messages via my phone

[downdawn]

Using the | symbol to separate is a feature of python3.10+

https://fastapi.tiangolo.com/python-types/#union

In the local win environment, I use conda to manage the switching environment, and in the Linux environment, I use pyenv. I can test different python versions.

[wu-clan]

Yes, but the library based on 3.10 encoding can run in the lower version. I didn’t find the relevant PEP, so I‘m a little confused.

If just replace Optional to Union, it is very convenient, no-optional

[downdawn]

python3.10+ can run directly

def process_item(item: int | str):
    print(item, type(item))


if __name__ == '__main__':
    process_item(1)  # 1 <class 'int'>
    process_item("1")  # 1 <class 'str'>

python3.7-3.9 can import from __future__ import annotations run

[downdawn]

After testing, no_optiona can replace Optional[str] = None with Union[str, None] = None

Can be used in pre-commit.

[wu-clan]

python3.10+ can run directly

python3.7-3.9 can import from __future__ import annotations run

Yes, This is expected.

There should be some problems in my submission that caused the error.

[wu-clan]

After testing, no_optiona can replace Optional[str] = None with Union[str, None] = None

Can be used in pre-commit.

If we use PEP563, this scheme will not be needed. I have updated it to | through ruff.

[downdawn]

OK