Blender Doesn't Permit Indices in Drivers? I have a variable in a driver that I would like to be able to "switch on and off". To do this, I figured I could give this variable a power, another variable that would link to a custom property. I can then make the custom property 1, for enabled, or 0 for disabled - as a number to the power 0 is 1 and 1 multiplied by another number is just that other number. 

I.e. x^y*z .

However Blender doesn't seem to support this. Here is the error from the console:
Traceback (most recent call last):
  File "", line 1, in 
TypeError: unsupported operand type(s) for ^: 'float' and 'float'

Any ideas as to why this is? It seems like pretty standard math to me. If not, any ideas how to get around it?
As I said in the comments

Raising a value to a power is pretty standard math, something python can defiantly do.

Your trouble comes from a simple python syntax error. You are using ^ when the syntax in python is  ** for power of (^ is the bitwise XOR operator
).  As you can see here in the python docs ** is the the correct form.

You could alternatively use pow() function.