[Tutor] How do I do square roots and exponents?
Wed, 27 Mar 2002 17:26:50 -0800 (PST)
> While toying around in Python, I decided to make a program that
> calculates the hypotenuse. I ran into a problem when I realized that I
> had no idea what the command was for square roots and exponents. Does
> anyone know?
Python has an exponentiation operator using the double stars "**", so you
can do something like this:
>>> 2 ** (0.5)
>>> 2 ** 8
If you'd rather like to use functions to do this, you may also find the
functions in the 'math' module very useful:
>>> math.pow(2, 8)
(Notice that math.pow is defined to return a floating point value.)
Finally, if you know about complex numbers, then you'll definitely want to
look at the cmath module:
since it properly supports things like taking the square root of negative
>>> (-1) ** (0.5)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ValueError: negative number cannot be raised to a fractional power
>>> import cmath