kwargs...
Python kwargs

What was painful?

self

Learned python by myself...
Took me two days to make a button copy text correctly.

Python has its quirks. And yes they are painful.

Variadic arguments are always kinky.

No matter what language :)

It's honestly not so bad. I see args and kwargs a bit like pointers.

I think having to maintain an embedded OOP C++98 code base with 10k LoC classes killed my soul, so I don't feel anything when dealing with quirky features from other languages.