Convert signatures to keyword-only arguments

[ddelange]

Hi @tkem 👋

Hoping this PR can land in v6 🤞

This PR:

• Reduces bug surface by using keyword-only arguments (PEP-3102) in most signatures.
• Makes condition, lock, info configurable for the cachetools.func module.
  • Switches from info=True default to info=False default analogous to the main module.
• Deprecates dummy_threading which has been unavailable since 3.7 (the minimum required version of cachetools in setup.cfg).
  • by the way, why is CI only running 3.9+?

[ddelange]

this is the typical type of bug that becomes impossible to make with keyword-only arguments

[ddelange]

This PR is green now on my fork 👍

[ddelange]

Hi @tkem 👋

This is ready for review

[tkem]

@ddelange: Thanks for your interest!

Without - i have to admit - looking too deeply into your submissions:

• Reduces bug surface by using keyword-only arguments: Good idea in principle, but a possibly (though probably unlikely) breaking change. I won't introduce something like this without giving at least six months notice with DeprecationWarning. So, yes, that was already on my list, but not for 6.0.
• Makes condition, lock, info configurable for the cachetools.func module: cachetools.func intentionally follows functools.lru_cache , and tries to stay as simple as possible for the user. Therefore, the choice to omit lock, condition, and info was deliberate, and will not change in the futue.
• Deprecates dummy_threading which has been unavailable since 3.7: Good point, I guess I just missed that.

So, could you just refactor and make a seperate PR for the "dummy_threading" stuff? Would be appreciated!

[tkem]

by the way, why is CI only running 3.9+?

Because it is the oldest officially supported Python version:

https://devguide.python.org/versions/

[ddelange]

Makes condition, lock, info configurable for the cachetools.func module.

• Switches from info=True default to info=False default analogous to the main module.

would it be an option to set a lock enabled by default en info disabled by default on the cachetools.func decorators? almost any use case I have for these decorators is multithreaded, essentially rendering the cachetools.func short hands useless

[ddelange]

by the way, why is CI only running 3.9+?

Because it is the oldest officially supported Python version:

https://devguide.python.org/versions/

although this is true, setup-python still supports 3.7. i would recommend to either bump setup.cfg to 3.9+, or include 3.7 in CI to avoid unwelcome surprises