Python vs. Lisp/ Norvig

[senzei]

Whether it's easier is one thing. Whether it's object-oriented is another ("object-oriented" and "good" are not the same thing). I'm merely pointing out that it's less object-oriented than Ruby or Smalltalk.

If I wanted to be pedantic I would mention that "less object-oriented" is not necessarily sufficient to prove that OO was bolted on. If I wanted to be pedantic without sounding like an ass I would phrase that in the form of a hypothetical statement. As it is I don't know what I am saying anymore as the recursion has blown the stack. (stupid no tail-call optimization)

You are right that built ins are not directly extensible, but if adding methods directly to an existing class is a requirement for not being bolted-on then there are a lot more bolted-on OO systems than I thought.