calculate logarithm in python

gistfile1.txt

# complexity: logarihmic! :D
def log2(n):
  result=0
  while n > 1:
    n//=2
    result +=1
  return result

import unittest
import math

class log2Test(unittest.TestCase):
  def setUp(self):
    pass

  def run1(self):
    for i in xrange(100):
      assert log2(i) == int(math.log(i,2))