Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_unary.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents aa0d2d51fbde
children 6768b2350c57 1c26505c1de6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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bee7557213b2 Test the unary operator changes to the compiler
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1 """Test compiler changes for unary ops (+, -, ~) introduced in Python 2.2"""
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2
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3 import unittest
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4 from test.test_support import run_unittest, have_unicode
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5
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6 class UnaryOpTestCase(unittest.TestCase):
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7
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8 def test_negative(self):
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9 self.assert_(-2 == 0 - 2)
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10 self.assert_(-0 == 0)
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11 self.assert_(--2 == 2)
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12 self.assert_(-2L == 0 - 2L)
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13 self.assert_(-2.0 == 0 - 2.0)
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14 self.assert_(-2j == 0 - 2j)
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15
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16 def test_positive(self):
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17 self.assert_(+2 == 2)
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18 self.assert_(+0 == 0)
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19 self.assert_(++2 == 2)
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20 self.assert_(+2L == 2L)
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21 self.assert_(+2.0 == 2.0)
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22 self.assert_(+2j == 2j)
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23
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24 def test_invert(self):
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25 self.assert_(-2 == 0 - 2)
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26 self.assert_(-0 == 0)
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27 self.assert_(--2 == 2)
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28 self.assert_(-2L == 0 - 2L)
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29
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30 def test_no_overflow(self):
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31 nines = "9" * 32
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32 self.assert_(eval("+" + nines) == eval("+" + nines + "L"))
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33 self.assert_(eval("-" + nines) == eval("-" + nines + "L"))
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34 self.assert_(eval("~" + nines) == eval("~" + nines + "L"))
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35
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36 def test_negation_of_exponentiation(self):
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37 # Make sure '**' does the right thing; these form a
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38 # regression test for SourceForge bug #456756.
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39 self.assertEqual(-2 ** 3, -8)
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40 self.assertEqual((-2) ** 3, -8)
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41 self.assertEqual(-2 ** 4, -16)
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42 self.assertEqual((-2) ** 4, 16)
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43
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44 def test_bad_types(self):
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45 for op in '+', '-', '~':
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46 self.assertRaises(TypeError, eval, op + "'a'")
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47 if have_unicode:
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48 self.assertRaises(TypeError, eval, op + "u'a'")
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49
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50 self.assertRaises(TypeError, eval, "~2j")
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51 self.assertRaises(TypeError, eval, "~2.0")
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52
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54 def test_main():
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55 run_unittest(UnaryOpTestCase)
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58 if __name__ == "__main__":
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59 test_main()