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Simple python code wont work. I cant tell why. I am new to python. Its derivative calculator  RSS feed

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I found this python code below from this link and was trying to get it to work. Its simple derivative calculator.

The answer should show up as 4. Can someone tell me why it wont work? I am completely new
to python. I created it in Notepad plus and am running from Windows 7 command prompt.
I get no errors but the answer does not show up. Anyone now why? thank you

#--------------begin code-------------
#import math package to allow for more function arguments
from math import*

def f(x):
#type your function after return
return x**2

#For instance f(2) = 4

def derive(function,value):
h = 0.00000000001
top = function(value + h) - function(value)
bottom = h
slope = top / bottom
# Returns the slope to the third decimal
return float("%.3f" % slope)

derive(f, 2)

#---------------end code--------------
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