Writing math functions in an Scripting language

Is there possibility of writing functions in an scripting language (Python or Jython, for instance) in this calculator: ?

Currently you can define your own functions in a very simple and clear way!
For example the following simply raises the first parameter to power of the 2nd param:

f(x,y)=x^y

You can even define recursive functions. The following is factorial:

fac(x)=x*f(x-1); x>1
fac(x)=1; x<=1

as shown below:



This is why we didn't feel the need to use other scripting languages.
Let me know if you don't feel this is enough