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I want to build a Python function that calculates,

alt text http://1.bp.blogspot.com/_mGF7Mo1o9b4/SlT2s9H7g_I/AAAAAAAAABE/RYgqR4C3XSM/s400/entropy

and would like to name my summation function Σ. In a similar fashion, would like to use Π for product, and so on. I was wondering if there was a way to name a python function in this fashion?

def Σ (..):
 ..
 ..

That is, does Python support unicode identifiers, and if so, could someone provide an example for it?

Thanks!

Original motivation for this was a piece of Clojure code I saw today that looks like,

(defn entropy [X]
 (* -1 (Σ [i X] (* (p i) (log (p i))))))

where Σ is a macro defined as,

(defmacro Σ
 ... )

and I thought that was pretty cool.