I was responding to "was more first class in popular languages". I know about python's functools lib and its memoisation decorator. Point was, if you didn't have it and wanted it, it's easy; no need for the language to provide it.
This guy sees your point and this guy does indeed wonder why it's there when 2*Pi will do. But if it's about python the answer is simple - unlike many other languages python does fold constants, but does't fold expressions using variables even if the variable is never changed so there's an unavoidable cost unless you write out the value literally, or have it as a constant.
