| 4710c53d |
1 | import test.test_support, unittest\r |
| 2 | \r |
| 3 | class PowTest(unittest.TestCase):\r |
| 4 | \r |
| 5 | def powtest(self, type):\r |
| 6 | if type != float:\r |
| 7 | for i in range(-1000, 1000):\r |
| 8 | self.assertEqual(pow(type(i), 0), 1)\r |
| 9 | self.assertEqual(pow(type(i), 1), type(i))\r |
| 10 | self.assertEqual(pow(type(0), 1), type(0))\r |
| 11 | self.assertEqual(pow(type(1), 1), type(1))\r |
| 12 | \r |
| 13 | for i in range(-100, 100):\r |
| 14 | self.assertEqual(pow(type(i), 3), i*i*i)\r |
| 15 | \r |
| 16 | pow2 = 1\r |
| 17 | for i in range(0,31):\r |
| 18 | self.assertEqual(pow(2, i), pow2)\r |
| 19 | if i != 30 : pow2 = pow2*2\r |
| 20 | \r |
| 21 | for othertype in int, long:\r |
| 22 | for i in range(-10, 0) + range(1, 10):\r |
| 23 | ii = type(i)\r |
| 24 | for j in range(1, 11):\r |
| 25 | jj = -othertype(j)\r |
| 26 | pow(ii, jj)\r |
| 27 | \r |
| 28 | for othertype in int, long, float:\r |
| 29 | for i in range(1, 100):\r |
| 30 | zero = type(0)\r |
| 31 | exp = -othertype(i/10.0)\r |
| 32 | if exp == 0:\r |
| 33 | continue\r |
| 34 | self.assertRaises(ZeroDivisionError, pow, zero, exp)\r |
| 35 | \r |
| 36 | il, ih = -20, 20\r |
| 37 | jl, jh = -5, 5\r |
| 38 | kl, kh = -10, 10\r |
| 39 | asseq = self.assertEqual\r |
| 40 | if type == float:\r |
| 41 | il = 1\r |
| 42 | asseq = self.assertAlmostEqual\r |
| 43 | elif type == int:\r |
| 44 | jl = 0\r |
| 45 | elif type == long:\r |
| 46 | jl, jh = 0, 15\r |
| 47 | for i in range(il, ih+1):\r |
| 48 | for j in range(jl, jh+1):\r |
| 49 | for k in range(kl, kh+1):\r |
| 50 | if k != 0:\r |
| 51 | if type == float or j < 0:\r |
| 52 | self.assertRaises(TypeError, pow, type(i), j, k)\r |
| 53 | continue\r |
| 54 | asseq(\r |
| 55 | pow(type(i),j,k),\r |
| 56 | pow(type(i),j)% type(k)\r |
| 57 | )\r |
| 58 | \r |
| 59 | def test_powint(self):\r |
| 60 | self.powtest(int)\r |
| 61 | \r |
| 62 | def test_powlong(self):\r |
| 63 | self.powtest(long)\r |
| 64 | \r |
| 65 | def test_powfloat(self):\r |
| 66 | self.powtest(float)\r |
| 67 | \r |
| 68 | def test_other(self):\r |
| 69 | # Other tests-- not very systematic\r |
| 70 | self.assertEqual(pow(3,3) % 8, pow(3,3,8))\r |
| 71 | self.assertEqual(pow(3,3) % -8, pow(3,3,-8))\r |
| 72 | self.assertEqual(pow(3,2) % -2, pow(3,2,-2))\r |
| 73 | self.assertEqual(pow(-3,3) % 8, pow(-3,3,8))\r |
| 74 | self.assertEqual(pow(-3,3) % -8, pow(-3,3,-8))\r |
| 75 | self.assertEqual(pow(5,2) % -8, pow(5,2,-8))\r |
| 76 | \r |
| 77 | self.assertEqual(pow(3L,3L) % 8, pow(3L,3L,8))\r |
| 78 | self.assertEqual(pow(3L,3L) % -8, pow(3L,3L,-8))\r |
| 79 | self.assertEqual(pow(3L,2) % -2, pow(3L,2,-2))\r |
| 80 | self.assertEqual(pow(-3L,3L) % 8, pow(-3L,3L,8))\r |
| 81 | self.assertEqual(pow(-3L,3L) % -8, pow(-3L,3L,-8))\r |
| 82 | self.assertEqual(pow(5L,2) % -8, pow(5L,2,-8))\r |
| 83 | \r |
| 84 | for i in range(-10, 11):\r |
| 85 | for j in range(0, 6):\r |
| 86 | for k in range(-7, 11):\r |
| 87 | if j >= 0 and k != 0:\r |
| 88 | self.assertEqual(\r |
| 89 | pow(i,j) % k,\r |
| 90 | pow(i,j,k)\r |
| 91 | )\r |
| 92 | if j >= 0 and k != 0:\r |
| 93 | self.assertEqual(\r |
| 94 | pow(long(i),j) % k,\r |
| 95 | pow(long(i),j,k)\r |
| 96 | )\r |
| 97 | \r |
| 98 | def test_bug643260(self):\r |
| 99 | class TestRpow:\r |
| 100 | def __rpow__(self, other):\r |
| 101 | return None\r |
| 102 | None ** TestRpow() # Won't fail when __rpow__ invoked. SF bug #643260.\r |
| 103 | \r |
| 104 | def test_bug705231(self):\r |
| 105 | # -1.0 raised to an integer should never blow up. It did if the\r |
| 106 | # platform pow() was buggy, and Python didn't worm around it.\r |
| 107 | eq = self.assertEqual\r |
| 108 | a = -1.0\r |
| 109 | # The next two tests can still fail if the platform floor()\r |
| 110 | # function doesn't treat all large inputs as integers\r |
| 111 | # test_math should also fail if that is happening\r |
| 112 | eq(pow(a, 1.23e167), 1.0)\r |
| 113 | eq(pow(a, -1.23e167), 1.0)\r |
| 114 | for b in range(-10, 11):\r |
| 115 | eq(pow(a, float(b)), b & 1 and -1.0 or 1.0)\r |
| 116 | for n in range(0, 100):\r |
| 117 | fiveto = float(5 ** n)\r |
| 118 | # For small n, fiveto will be odd. Eventually we run out of\r |
| 119 | # mantissa bits, though, and thereafer fiveto will be even.\r |
| 120 | expected = fiveto % 2.0 and -1.0 or 1.0\r |
| 121 | eq(pow(a, fiveto), expected)\r |
| 122 | eq(pow(a, -fiveto), expected)\r |
| 123 | eq(expected, 1.0) # else we didn't push fiveto to evenness\r |
| 124 | \r |
| 125 | def test_main():\r |
| 126 | test.test_support.run_unittest(PowTest)\r |
| 127 | \r |
| 128 | if __name__ == "__main__":\r |
| 129 | test_main()\r |
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