>>      # Let's write reusable code, and unit test it.
>>      def add_money(amounts):
>>          # do arithmetic in pennies so as not to
>> accumulate float errors
>>          pennies = sum([round(int(amount * 100)) for
>> amount in amounts])
>>          return float(pennies / 100.0)
>>      import unittest
>>      class TestAddMoney(unittest.TestCase):
>>          def test_float_errors(self):
>>              self.failUnlessEqual(add_money([0.13,
>> 0.02]), 0.15)
>>              self.failUnlessEqual(add_money([100.01,
>> 99.99]), 200)
>>              self.failUnlessEqual(add_money([0,
>> -13.00, 13.00]), 0)
>>      if __name__ == '__main__':
>>          unittest.main()

> Just a minor quibble, but wouldn't you want the import
> and test class to only get executed in the ___main__
> context?