Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_pow.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 64903ff76ede
children 614c84670c63
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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f260343eccf1 Port test_pow.py to PyUnit. From SF patch #662807
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1 import test.test_support, unittest
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2
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3 class PowTest(unittest.TestCase):
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4
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5 def powtest(self, type):
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6 if type != float:
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7 for i in range(-1000, 1000):
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8 self.assertEquals(pow(type(i), 0), 1)
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9 self.assertEquals(pow(type(i), 1), type(i))
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10 self.assertEquals(pow(type(0), 1), type(0))
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11 self.assertEquals(pow(type(1), 1), type(1))
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12
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13 for i in range(-100, 100):
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14 self.assertEquals(pow(type(i), 3), i*i*i)
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15
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16 pow2 = 1
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17 for i in range(0,31):
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18 self.assertEquals(pow(2, i), pow2)
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19 if i != 30 : pow2 = pow2*2
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20
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21 for othertype in int, long:
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22 for i in range(-10, 0) + range(1, 10):
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23 ii = type(i)
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24 for j in range(1, 11):
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25 jj = -othertype(j)
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26 pow(ii, jj)
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27
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28 for othertype in int, long, float:
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29 for i in range(1, 100):
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30 zero = type(0)
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31 exp = -othertype(i/10.0)
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32 if exp == 0:
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33 continue
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34 self.assertRaises(ZeroDivisionError, pow, zero, exp)
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35
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36 il, ih = -20, 20
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37 jl, jh = -5, 5
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38 kl, kh = -10, 10
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39 asseq = self.assertEqual
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40 if type == float:
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41 il = 1
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42 asseq = self.assertAlmostEqual
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43 elif type == int:
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44 jl = 0
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45 elif type == long:
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46 jl, jh = 0, 15
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47 for i in range(il, ih+1):
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48 for j in range(jl, jh+1):
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49 for k in range(kl, kh+1):
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50 if k != 0:
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51 if type == float or j < 0:
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52 self.assertRaises(TypeError, pow, type(i), j, k)
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53 continue
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54 asseq(
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55 pow(type(i),j,k),
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56 pow(type(i),j)% type(k)
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57 )
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58
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59 def test_powint(self):
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60 self.powtest(int)
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61
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62 def test_powlong(self):
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63 self.powtest(long)
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64
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65 def test_powfloat(self):
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66 self.powtest(float)
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67
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68 def test_other(self):
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69 # Other tests-- not very systematic
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70 self.assertEquals(pow(3,3) % 8, pow(3,3,8))
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71 self.assertEquals(pow(3,3) % -8, pow(3,3,-8))
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72 self.assertEquals(pow(3,2) % -2, pow(3,2,-2))
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73 self.assertEquals(pow(-3,3) % 8, pow(-3,3,8))
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74 self.assertEquals(pow(-3,3) % -8, pow(-3,3,-8))
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75 self.assertEquals(pow(5,2) % -8, pow(5,2,-8))
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76
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77 self.assertEquals(pow(3L,3L) % 8, pow(3L,3L,8))
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78 self.assertEquals(pow(3L,3L) % -8, pow(3L,3L,-8))
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79 self.assertEquals(pow(3L,2) % -2, pow(3L,2,-2))
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80 self.assertEquals(pow(-3L,3L) % 8, pow(-3L,3L,8))
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81 self.assertEquals(pow(-3L,3L) % -8, pow(-3L,3L,-8))
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82 self.assertEquals(pow(5L,2) % -8, pow(5L,2,-8))
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83
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84 for i in range(-10, 11):
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85 for j in range(0, 6):
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86 for k in range(-7, 11):
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87 if j >= 0 and k != 0:
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88 self.assertEquals(
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89 pow(i,j) % k,
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90 pow(i,j,k)
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91 )
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92 if j >= 0 and k != 0:
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93 self.assertEquals(
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94 pow(long(i),j) % k,
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95 pow(long(i),j,k)
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96 )
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97
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98 def test_bug643260(self):
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99 class TestRpow:
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100 def __rpow__(self, other):
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101 return None
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102 None ** TestRpow() # Won't fail when __rpow__ invoked. SF bug #643260.
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103
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104 def test_bug705231(self):
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105 # -1.0 raised to an integer should never blow up. It did if the
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106 # platform pow() was buggy, and Python didn't worm around it.
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107 eq = self.assertEquals
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108 a = -1.0
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109 # The next two tests can still fail if the platform floor()
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110 # function doesn't treat all large inputs as integers
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111 # test_math should also fail if that is happening
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112 eq(pow(a, 1.23e167), 1.0)
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113 eq(pow(a, -1.23e167), 1.0)
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114 for b in range(-10, 11):
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115 eq(pow(a, float(b)), b & 1 and -1.0 or 1.0)
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116 for n in range(0, 100):
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117 fiveto = float(5 ** n)
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118 # For small n, fiveto will be odd. Eventually we run out of
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119 # mantissa bits, though, and thereafer fiveto will be even.
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120 expected = fiveto % 2.0 and -1.0 or 1.0
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121 eq(pow(a, fiveto), expected)
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122 eq(pow(a, -fiveto), expected)
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123 eq(expected, 1.0) # else we didn't push fiveto to evenness
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Fred Drake <fdrake@acm.org>
parents: 18507
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124
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f260343eccf1 Port test_pow.py to PyUnit. From SF patch #662807
Walter Dörwald <walter@livinglogic.de>
parents: 26567
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125 def test_main():
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Walter Dörwald <walter@livinglogic.de>
parents: 27650
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126 test.test_support.run_unittest(PowTest)
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7e001c4810bb Test set for new pow() function
Guido van Rossum <guido@python.org>
parents:
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127
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Walter Dörwald <walter@livinglogic.de>
parents: 26567
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128 if __name__ == "__main__":
f260343eccf1 Port test_pow.py to PyUnit. From SF patch #662807
Walter Dörwald <walter@livinglogic.de>
parents: 26567
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129 test_main()