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comp.lang.python |
>> http://wiki.python.org/moin/SimplePrograms > Done. # Let's write reusable code, and unit test it. I believe I've still kept it to 13 lines. STeVe P.S. The "right" way to add money is using the decimal module, but I Steve Howell wrote: I think I would rewrite the current unit-testing example to use the
> --- Steven Bethard <steven.beth...@gmail.com> wrote:
>> Very cool! Do you mind putting this up on the Wiki
>> somewhere so that we
>> can link to it more easily? Maybe something like:
standard library unittest module::
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()
couldn't think of a better example.