| from __future__ import division |
| # When true division is the default, get rid of this and add it to |
| # test_long.py instead. In the meantime, it's too obscure to try to |
| # trick just part of test_long into using future division. |
| |
| import unittest |
| from test.support import run_unittest |
| |
| class TrueDivisionTests(unittest.TestCase): |
| def test(self): |
| huge = 1 << 40000 |
| mhuge = -huge |
| self.assertEqual(huge / huge, 1.0) |
| self.assertEqual(mhuge / mhuge, 1.0) |
| self.assertEqual(huge / mhuge, -1.0) |
| self.assertEqual(mhuge / huge, -1.0) |
| self.assertEqual(1 / huge, 0.0) |
| self.assertEqual(1 / huge, 0.0) |
| self.assertEqual(1 / mhuge, 0.0) |
| self.assertEqual(1 / mhuge, 0.0) |
| self.assertEqual((666 * huge + (huge >> 1)) / huge, 666.5) |
| self.assertEqual((666 * mhuge + (mhuge >> 1)) / mhuge, 666.5) |
| self.assertEqual((666 * huge + (huge >> 1)) / mhuge, -666.5) |
| self.assertEqual((666 * mhuge + (mhuge >> 1)) / huge, -666.5) |
| self.assertEqual(huge / (huge << 1), 0.5) |
| self.assertEqual((1000000 * huge) / huge, 1000000) |
| |
| namespace = {'huge': huge, 'mhuge': mhuge} |
| |
| for overflow in ["float(huge)", "float(mhuge)", |
| "huge / 1", "huge / 2", "huge / -1", "huge / -2", |
| "mhuge / 100", "mhuge / 200"]: |
| # XXX(cwinter) this test doesn't pass when converted to |
| # use assertRaises. |
| try: |
| eval(overflow, namespace) |
| self.fail("expected OverflowError from %r" % overflow) |
| except OverflowError: |
| pass |
| |
| for underflow in ["1 / huge", "2 / huge", "-1 / huge", "-2 / huge", |
| "100 / mhuge", "200 / mhuge"]: |
| result = eval(underflow, namespace) |
| self.assertEqual(result, 0.0, |
| "expected underflow to 0 from %r" % underflow) |
| |
| for zero in ["huge / 0", "mhuge / 0"]: |
| self.assertRaises(ZeroDivisionError, eval, zero, namespace) |
| |
| |
| def test_main(): |
| run_unittest(TrueDivisionTests) |
| |
| if __name__ == "__main__": |
| test_main() |