try setting black on 120 length

[ArtemIsmagilov]

the main thing here is setting up pyproject.toml. what do you think about the new string length?
is it comfortable for writing and reading code?

...
# pyproject.toml
[tool.black]
line-length = 120

[tobixen]

https://stackoverflow.com/questions/88942/why-does-pep-8-specify-a-maximum-line-length-of-79-characters is an interesting read.

Personally I think the 79 character lmiit is stupid, for one thing, sometimes it makes it difficult to use tools like grep on the code, and it's quite silly when there is a long list in the code with one element pr line, and then the black-plugin goes in and convert one of the lines to a multiline. Another argument is that the 79-character limit often makes me stop up in the middle of the coding just to spend efforts considering how to wrap the lines (at least that argument is moot since black does it for me now). At he other hand, I see no reason why the caldav-project should deviate from the standard given in pep8. I also think it's stupid to first format the code with a 79 character line limit, and then reformat it to 120 lines later.

[ArtemIsmagilov]

Pep8 my favourite rules)