Migrate to 'black' for consistent styling and formatting

[BeyondEvil]

black

[BeyondEvil]

Sorry to bother you @nicoddemus, but I think I need your help.

When running tests using xdist, some tests fail when using 2.7 and pypy.

But running without xdist they pass.

Any idea why that is, and if it's fixable?

Thanks! 🙏

[nicoddemus]

Sorry to bother you @nicoddemus, but I think I need your help.

No problem at all!

I did some investigation and I suspect that it is related to a long-standing issue on how workers are initialized in xdist, see pytest-dev/pytest-xdist#448. I'm afraid there's no simple solution for now, because pytest-dev/pytest-xdist#448 will require pytest>=5.1, which no longer supports Python 2.7 anyway. 😕

My suggestion is to just execute pytest-html without xdist for now on Python 2.

[BeyondEvil]

Thank you @nicoddemus ! I appreciate it!

Glad I didn't go down the rabbit hole of trying to troubleshoot this then. I'll do what you advise. 😊

Thanks again!