It is not practical to write pure python code. There's always the implicit state of a generator so lazyness is fucked. And you don't know whether you're passed

It is not practical to write pure python code. There's always the implicit state of a generator so lazyness is fucked. And you don't know whether you're passed a list or a generator and then you tuple-unpack it and the generator is empty. And then, of course, you can override the dot-operator and even bare statements can have side effects. Have you ever tried to write really _pure_ python? I did and it is harder than it needs to be.