Phillip, I think there is a certain schizophrenia in Python between the older original procedural/functional orientation (itself somewhat split), and the newer-fangled (for Python) object style, between len(obj) and obj.len(). That's what makes it hard to evaluate the pros and cons between adding generic functions (as Lisp did, to support its own functional style), and adding interfaces (in whatever fashion) to support the object-oriented view of life.
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