typeerror unsupported operand type(s) for ^: 'float' and 'float' in python and fusion360

Question

I'm trying to get a distance calculated in mm's with a for next loop in python for fusion360.

The calculation gives an error:

typeerror unsupported operand type(s) for ^: 'float' and 'float'

The calulation is:

distance = scale - (scale / 2^ (x/12))

I think it has to do with casting to int numbers (although I think it must be possible work with values in milimeters with 2 decimals). I've tried

distance = int(scale - (scale / 2^ (x/12)))

and

distance = int(scale - (float(scale / 2^ (x/12)) )

But all give me the dreaded typeerror....

Who can point me in the right direction?