54 lines
2.1 KiB
Python
54 lines
2.1 KiB
Python
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.test_support import run_unittest
|
|
|
|
class TrueDivisionTests(unittest.TestCase):
|
|
def test(self):
|
|
huge = 1L << 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(1L / huge, 0.0)
|
|
self.assertEqual(1 / mhuge, 0.0)
|
|
self.assertEqual(1L / 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 / 2L", "huge / -1", "huge / -2L",
|
|
"mhuge / 100", "mhuge / 100L"]:
|
|
# If the "eval" does not happen in this module,
|
|
# true division is not enabled
|
|
with self.assertRaises(OverflowError):
|
|
eval(overflow, namespace)
|
|
|
|
for underflow in ["1 / huge", "2L / huge", "-1 / huge", "-2L / huge",
|
|
"100 / mhuge", "100L / mhuge"]:
|
|
result = eval(underflow, namespace)
|
|
self.assertEqual(result, 0.0, 'expected underflow to 0 '
|
|
'from {!r}'.format(underflow))
|
|
|
|
for zero in ["huge / 0", "huge / 0L", "mhuge / 0", "mhuge / 0L"]:
|
|
with self.assertRaises(ZeroDivisionError):
|
|
eval(zero, namespace)
|
|
|
|
|
|
def test_main():
|
|
run_unittest(TrueDivisionTests)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|