Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_long_future.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 4b9fa8092e82
children 19964944cc01 606a45dbd10c
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91533675d6cb Change long/long true division to return as many good bits as it can;
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1 from __future__ import division
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2 # When true division is the default, get rid of this and add it to
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3 # test_long.py instead. In the meantime, it's too obscure to try to
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4 # trick just part of test_long into using future division.
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5
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6 import unittest
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7 from test.test_support import run_unittest
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8
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9 class TrueDivisionTests(unittest.TestCase):
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10 def test(self):
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11 huge = 1L << 40000
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12 mhuge = -huge
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13 self.assertEqual(huge / huge, 1.0)
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14 self.assertEqual(mhuge / mhuge, 1.0)
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15 self.assertEqual(huge / mhuge, -1.0)
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16 self.assertEqual(mhuge / huge, -1.0)
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17 self.assertEqual(1 / huge, 0.0)
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18 self.assertEqual(1L / huge, 0.0)
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19 self.assertEqual(1 / mhuge, 0.0)
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20 self.assertEqual(1L / mhuge, 0.0)
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21 self.assertEqual((666 * huge + (huge >> 1)) / huge, 666.5)
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22 self.assertEqual((666 * mhuge + (mhuge >> 1)) / mhuge, 666.5)
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23 self.assertEqual((666 * huge + (huge >> 1)) / mhuge, -666.5)
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24 self.assertEqual((666 * mhuge + (mhuge >> 1)) / huge, -666.5)
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25 self.assertEqual(huge / (huge << 1), 0.5)
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26 self.assertEqual((1000000 * huge) / huge, 1000000)
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27
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28 namespace = {'huge': huge, 'mhuge': mhuge}
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30 for overflow in ["float(huge)", "float(mhuge)",
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31 "huge / 1", "huge / 2L", "huge / -1", "huge / -2L",
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32 "mhuge / 100", "mhuge / 100L"]:
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33 # XXX(cwinter) this test doesn't pass when converted to
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34 # use assertRaises.
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35 try:
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36 eval(overflow, namespace)
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37 self.fail("expected OverflowError from %r" % overflow)
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38 except OverflowError:
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39 pass
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40
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41 for underflow in ["1 / huge", "2L / huge", "-1 / huge", "-2L / huge",
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42 "100 / mhuge", "100L / mhuge"]:
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43 result = eval(underflow, namespace)
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44 self.assertEqual(result, 0.0,
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45 "expected underflow to 0 from %r" % underflow)
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46
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47 for zero in ["huge / 0", "huge / 0L", "mhuge / 0", "mhuge / 0L"]:
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48 self.assertRaises(ZeroDivisionError, eval, zero, namespace)
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51 def test_main():
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52 run_unittest(TrueDivisionTests)
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53
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54 if __name__ == "__main__":
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55 test_main()