Decent GUI library?

[Dahliiin]

I just started coding with python. Before I used Java and for my GUIs I used Swing, which includes the Window Builder which is nice and handy. So I started looking for a good library in python to make GUIs. I found kivy and installed it, as well as the kivy designer, however the designer is deprecated and doesnt even work anymore. However it took my way too long to install kivy and get it running, and now it doesnt work, which kinda makes me mad.

So my question is, what is the best/decent GUI library for python with a designer?