Yet another Google Calculator shell in Python

For the sake of weekend hack and getting rid of some headache of post bangpypers meetup chicken overload of today's evening -

import re
import urllib
import mechanize
import unittest

class GCalc:
   def __init__(self):
       self.browser = mechanize.Browser()
       self.browser.set_handle_robots(False)
       self.browser.addheaders = \
           [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1')]

   def cleanup(self,text):
       strip_tags = re.compile("<.*?>")
       return strip_tags.sub('', text.replace("<sup>","^").replace("</sup>","").replace("×","X"))

   def calc(self, query):
       try:
           raw_result = self.browser.open("http://www.google.com/search?hl=en&q="+urllib.quote_plus(query)).read()
           return self.parse(raw_result)
       except:
           return "Failed to reach Google"

   def parse(self, raw_result):
       try:
           result = raw_result.split('''<td style="vertical-align:top" >''')[1].split('</h2>')[0] + '</h2>'
           return self.cleanup(result)
       except:
           return "Not a calculator query"

class TestGCalc(unittest.TestCase):
   def setUp(self):
       self.g = GCalc()

   def test_numeric(self):
       self.assertEqual(self.g.calc("4+5"), "4 + 5 = 9")

   def test_bignumbers(self):
       self.assertEqual(self.g.calc("234623476 * 59999999999"), "234 623 476 * 59 999 999 999 = 1.40774086 X 10^19")

   def test_units(self):
       self.assertEqual(self.g.calc("14 inch in mm"), "14 inch = 355.6 millimeters")
       self.assertEqual(self.g.calc("one acre"), "one acre = 4\xc2\xa0046.85642 m^2")

   def test_cacl(self):
       self.assertEqual(self.g.calc("3 * PI / sin(3)"), "(3 * PI) / sin(3) = 66.7855543")

   def test_facts(self):
       self.assertEqual(self.g.calc("speed of light"), "the speed of light = 299\xc2\xa0792\xc2\xa0458 m / s")


if __name__=='__main__':
   unittest.main()

Fork it here, have fun, curse me for crappy splits :)
Just learnt unittest a bit, ah so easy and useful :D

I guess you can notice the grand theme here - Its just ~ 50 lines of code packed up with a unit test and does the job!

I suggest you better not miss PyCon India 2010 in case you too are eager to do some productivity magic with you/your employees/students/etc.

Adios