No language is perfect, but if those are the worst examples you can come up with for Python, there really is no comparison with the insane JavaScript WTF's I've

No language is perfect, but if those are the worst examples you can come up with for Python, there really is no comparison with the insane JavaScript WTF's I've seen. Default list/dictionary arguments are plain evil in Python, no disagreeing there. I've been bitten by something like the following before, which is similar to your snippet: x = y = [] x.append(2) print x print y As for your other examples: except for Pascal/Delphi, I have never used a language that has separate division operators for floats and integers, so at least for me it's only natural that 3/2 == 1, how else would I do integer division? The print example is just very weak, I can hardly even call it a WTF. Yes it's a little odd, but you're not going to hit weird runtime bugs like when you are comparing things in JavaScript, for example. I'm frankly very surprised by the almost complete absence of real Python WTF's in the Stack Overflow discussion you linked, I would have expected more. If anything, it actually shows how clean and predictable Python is.