Revision 0f45b2a9-e65e-4074-8f88-9286392fafd3 - Stack Overflow

I want to build a Python function that calculates,

![alt text][1]

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!

 [1]: https://1.bp.blogspot.com/_mGF7Mo1o9b4/SlT2s9H7g_I/AAAAAAAAABE/RYgqR4C3XSM/s400/entropy


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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.


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BTW, to address a couple of comments about readability - with a lot of stats/ML code for instance, being able to compose operations with symbols would be really helpful. (Especially for really complex integrals et al)

 φ(z) = ∫(N(x|0,1,1), -∞, z)

vs

 Phi(z) = integral(N(x|0,1,1), -inf, z)

or even just the lambda character for lambda()!