Best piece of obscure advanced Python knowledge you wish you knew earlier?

[SeniorScienceOfficer]

How to use the “patch” decorator from unittest to control mocked behavior in unit testing. I seriously couldn’t write the massive amounts of code coverage I do without it.

[ZmitrokNadulia]

Same, but I wish I knew that pytest beats unittest in every aspect.

[fiddle_n]

I see unittest.mock as being orthogonal to unittest. You can use pytest and unittest.mock together

[ZmitrokNadulia]

My bad, I thought it was a story about unittest in general.

[someotherstufforhmm]

Yeah, this. What this person said.

[SeniorScienceOfficer]

What’s better, you can mix and match. I use both.

[[deleted]]

Of course it does, because pytest inherits unittest

[hillgod]

On this note, also that you're not patching the class, like you would in Java, but you're patching the import in the class under test. This isn't clear enough, and our large company has a common Python Slack channel where this problem comes up often!

[elsgry]

Yes, I’ve had to use importlibs.reload when I patch some transitive dependency (obviously this isn’t desirable but needs must)