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I feel your frustration. As for a good, open source Python IDE, have you tried IntelliJ IDEA (or PyCharm)? I use it for both Java, Kotlin and Python, and I've been pretty happy with it. 

https://www.jetbrains.com/idea/https://github.com/JetBrains/intellij-community

I have not though recently I've been learning emacs + spacemacs and I'm really enjoying it.