annotate Lib/test/test_struct.py @ 64166:d0e9febfa00a 3.1

Merged revisions 84172 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r84172 | martin.v.loewis | 2010-08-18 18:12:23 +0200 (Mi, 18 Aug 2010) | 2 lines Restore GIL in nis_cat in case of error. ........
author Martin v. Löwis <martin@v.loewis.de>
date Thu, 19 Aug 2010 09:03:03 +0000
parents 8c6b3dc652fb
children bf94b6a73fc8 3c9232a684ae
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1 import array
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2 import unittest
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3 import struct
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4 import sys
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5
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6 from test.support import run_unittest
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7
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8 ISBIGENDIAN = sys.byteorder == "big"
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9 IS32BIT = sys.maxsize == 0x7fffffff
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10
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11 def string_reverse(s):
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12 return s[::-1]
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13
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14 def bigendian_to_native(value):
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15 if ISBIGENDIAN:
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16 return value
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17 else:
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18 return string_reverse(value)
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20 class StructTest(unittest.TestCase):
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21 def test_isbigendian(self):
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22 self.assertEqual((struct.pack('=i', 1)[0] == 0), ISBIGENDIAN)
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24 def test_consistence(self):
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25 self.assertRaises(struct.error, struct.calcsize, 'Z')
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26
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27 sz = struct.calcsize('i')
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28 self.assertEqual(sz * 3, struct.calcsize('iii'))
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29
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30 fmt = 'cbxxxxxxhhhhiillffd?'
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31 fmt3 = '3c3b18x12h6i6l6f3d3?'
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32 sz = struct.calcsize(fmt)
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33 sz3 = struct.calcsize(fmt3)
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34 self.assertEqual(sz * 3, sz3)
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36 self.assertRaises(struct.error, struct.pack, 'iii', 3)
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37 self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3)
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38 self.assertRaises(struct.error, struct.pack, 'i', 'foo')
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39 self.assertRaises(struct.error, struct.pack, 'P', 'foo')
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40 self.assertRaises(struct.error, struct.unpack, 'd', b'flap')
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41 s = struct.pack('ii', 1, 2)
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42 self.assertRaises(struct.error, struct.unpack, 'iii', s)
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43 self.assertRaises(struct.error, struct.unpack, 'i', s)
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45 def test_transitiveness(self):
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46 c = b'a'
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47 b = 1
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48 h = 255
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49 i = 65535
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50 l = 65536
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51 f = 3.1415
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52 d = 3.1415
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53 t = True
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54
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55 for prefix in ('', '@', '<', '>', '=', '!'):
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56 for format in ('xcbhilfd?', 'xcBHILfd?'):
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57 format = prefix + format
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58 s = struct.pack(format, c, b, h, i, l, f, d, t)
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59 cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s)
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60 self.assertEqual(cp, c)
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61 self.assertEqual(bp, b)
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62 self.assertEqual(hp, h)
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63 self.assertEqual(ip, i)
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64 self.assertEqual(lp, l)
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65 self.assertEqual(int(100 * fp), int(100 * f))
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66 self.assertEqual(int(100 * dp), int(100 * d))
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67 self.assertEqual(tp, t)
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68
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69 def test_new_features(self):
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70 # Test some of the new features in detail
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71 # (format, argument, big-endian result, little-endian result, asymmetric)
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72 tests = [
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73 ('c', 'a', 'a', 'a', 0),
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74 ('xc', 'a', '\0a', '\0a', 0),
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75 ('cx', 'a', 'a\0', 'a\0', 0),
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76 ('s', 'a', 'a', 'a', 0),
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77 ('0s', 'helloworld', '', '', 1),
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78 ('1s', 'helloworld', 'h', 'h', 1),
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79 ('9s', 'helloworld', 'helloworl', 'helloworl', 1),
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80 ('10s', 'helloworld', 'helloworld', 'helloworld', 0),
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81 ('11s', 'helloworld', 'helloworld\0', 'helloworld\0', 1),
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82 ('20s', 'helloworld', 'helloworld'+10*'\0', 'helloworld'+10*'\0', 1),
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83 ('b', 7, '\7', '\7', 0),
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84 ('b', -7, '\371', '\371', 0),
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85 ('B', 7, '\7', '\7', 0),
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86 ('B', 249, '\371', '\371', 0),
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87 ('h', 700, '\002\274', '\274\002', 0),
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88 ('h', -700, '\375D', 'D\375', 0),
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89 ('H', 700, '\002\274', '\274\002', 0),
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90 ('H', 0x10000-700, '\375D', 'D\375', 0),
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91 ('i', 70000000, '\004,\035\200', '\200\035,\004', 0),
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92 ('i', -70000000, '\373\323\342\200', '\200\342\323\373', 0),
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93 ('I', 70000000, '\004,\035\200', '\200\035,\004', 0),
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94 ('I', 0x100000000-70000000, '\373\323\342\200', '\200\342\323\373', 0),
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95 ('l', 70000000, '\004,\035\200', '\200\035,\004', 0),
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96 ('l', -70000000, '\373\323\342\200', '\200\342\323\373', 0),
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97 ('L', 70000000, '\004,\035\200', '\200\035,\004', 0),
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98 ('L', 0x100000000-70000000, '\373\323\342\200', '\200\342\323\373', 0),
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99 ('f', 2.0, '@\000\000\000', '\000\000\000@', 0),
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100 ('d', 2.0, '@\000\000\000\000\000\000\000',
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101 '\000\000\000\000\000\000\000@', 0),
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102 ('f', -2.0, '\300\000\000\000', '\000\000\000\300', 0),
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103 ('d', -2.0, '\300\000\000\000\000\000\000\000',
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104 '\000\000\000\000\000\000\000\300', 0),
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105 ('?', 0, '\0', '\0', 0),
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106 ('?', 3, '\1', '\1', 1),
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107 ('?', True, '\1', '\1', 0),
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108 ('?', [], '\0', '\0', 1),
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109 ('?', (1,), '\1', '\1', 1),
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110 ]
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111
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112 for fmt, arg, big, lil, asy in tests:
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113 big = bytes(big, "latin-1")
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114 lil = bytes(lil, "latin-1")
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115 for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),
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116 ('='+fmt, ISBIGENDIAN and big or lil)]:
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117 res = struct.pack(xfmt, arg)
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118 self.assertEqual(res, exp)
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119 self.assertEqual(struct.calcsize(xfmt), len(res))
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120 rev = struct.unpack(xfmt, res)[0]
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121 if isinstance(arg, str):
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122 # Strings are returned as bytes since you can't know the
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123 # encoding of the string when packed.
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124 arg = bytes(arg, 'latin1')
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125 if rev != arg:
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126 self.assertTrue(asy)
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127
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128 def test_native_qQ(self):
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129 # can't pack -1 as unsigned regardless
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130 self.assertRaises((struct.error, OverflowError), struct.pack, "Q", -1)
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131 # can't pack string as 'q' regardless
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132 self.assertRaises(struct.error, struct.pack, "q", "a")
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133 # ditto, but 'Q'
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134 self.assertRaises(struct.error, struct.pack, "Q", "a")
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135
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136 try:
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137 struct.pack("q", 5)
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138 except struct.error:
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139 # does not have native q/Q
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140 pass
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141 else:
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142 nbytes = struct.calcsize('q')
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143 # The expected values here are in big-endian format, primarily
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144 # because I'm on a little-endian machine and so this is the
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145 # clearest way (for me) to force the code to get exercised.
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146 for format, input, expected in (
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147 ('q', -1, '\xff' * nbytes),
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148 ('q', 0, '\x00' * nbytes),
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149 ('Q', 0, '\x00' * nbytes),
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150 ('q', 1, '\x00' * (nbytes-1) + '\x01'),
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151 ('Q', (1 << (8*nbytes))-1, '\xff' * nbytes),
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152 ('q', (1 << (8*nbytes-1))-1, '\x7f' + '\xff' * (nbytes - 1))):
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153 expected = bytes(expected, "latin-1")
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154 got = struct.pack(format, input)
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155 native_expected = bigendian_to_native(expected)
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156 self.assertEqual(got, native_expected)
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157 retrieved = struct.unpack(format, got)[0]
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158 self.assertEqual(retrieved, input)
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159
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160 def test_standard_integers(self):
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161 # Standard integer tests (bBhHiIlLqQ).
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162 import binascii
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163
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164 class IntTester(unittest.TestCase):
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165
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166 def __init__(self, formatpair, bytesize):
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167 super(IntTester, self).__init__(methodName='test_one')
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168 self.assertEqual(len(formatpair), 2)
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169 self.formatpair = formatpair
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170 for direction in "<>!=":
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171 for code in formatpair:
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172 format = direction + code
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173 self.assertEqual(struct.calcsize(format), bytesize)
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174 self.bytesize = bytesize
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175 self.bitsize = bytesize * 8
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176 self.signed_code, self.unsigned_code = formatpair
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177 self.unsigned_min = 0
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178 self.unsigned_max = 2**self.bitsize - 1
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179 self.signed_min = -(2**(self.bitsize-1))
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180 self.signed_max = 2**(self.bitsize-1) - 1
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181
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182 def test_one(self, x, pack=struct.pack,
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183 unpack=struct.unpack,
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184 unhexlify=binascii.unhexlify):
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185 # Try signed.
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186 code = self.signed_code
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187 if self.signed_min <= x <= self.signed_max:
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188 # Try big-endian.
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189 expected = x
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190 if x < 0:
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191 expected += 1 << self.bitsize
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192 self.assertTrue(expected > 0)
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193 expected = hex(expected)[2:] # chop "0x"
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194 if len(expected) & 1:
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195 expected = "0" + expected
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196 expected = unhexlify(expected)
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197 expected = b"\x00" * (self.bytesize - len(expected)) + expected
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198
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199 # Pack work?
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200 format = ">" + code
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201 got = pack(format, x)
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202 self.assertEqual(got, expected)
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203
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204 # Unpack work?
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205 retrieved = unpack(format, got)[0]
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206 self.assertEqual(x, retrieved)
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207
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208 # Adding any byte should cause a "too big" error.
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209 self.assertRaises((struct.error, TypeError),
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210 unpack, format, b'\x01' + got)
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211
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212 # Try little-endian.
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213 format = "<" + code
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214 expected = string_reverse(expected)
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215
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216 # Pack work?
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217 got = pack(format, x)
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218 self.assertEqual(got, expected)
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219
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220 # Unpack work?
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221 retrieved = unpack(format, got)[0]
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222 self.assertEqual(x, retrieved)
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223
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224 # Adding any byte should cause a "too big" error.
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225 self.assertRaises((struct.error, TypeError),
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226 unpack, format, b'\x01' + got)
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227
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228 else:
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229 # x is out of range -- verify pack realizes that.
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230 self.assertRaises(struct.error, pack, ">" + code, x)
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231 self.assertRaises(struct.error, pack, "<" + code, x)
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232
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233 # Much the same for unsigned.
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234 code = self.unsigned_code
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235 if self.unsigned_min <= x <= self.unsigned_max:
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236 # Try big-endian.
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237 format = ">" + code
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238 expected = x
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239 expected = hex(expected)[2:] # chop "0x"
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240 if len(expected) & 1:
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241 expected = "0" + expected
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242 expected = unhexlify(expected)
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243 expected = b"\x00" * (self.bytesize - len(expected)) + expected
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244
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245 # Pack work?
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246 got = pack(format, x)
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247 self.assertEqual(got, expected)
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248
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249 # Unpack work?
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250 retrieved = unpack(format, got)[0]
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251 self.assertEqual(x, retrieved)
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252
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253 # Adding any byte should cause a "too big" error.
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254 self.assertRaises((struct.error, TypeError),
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255 unpack, format, b'\x01' + got)
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256
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257 # Try little-endian.
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258 format = "<" + code
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259 expected = string_reverse(expected)
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260
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261 # Pack work?
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262 got = pack(format, x)
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263 self.assertEqual(got, expected)
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264
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265 # Unpack work?
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266 retrieved = unpack(format, got)[0]
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267 self.assertEqual(x, retrieved)
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268
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269 # Adding any byte should cause a "too big" error.
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270 self.assertRaises((struct.error, TypeError),
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271 unpack, format, b'\x01' + got)
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272
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273 else:
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274 # x is out of range -- verify pack realizes that.
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275 self.assertRaises(struct.error, pack, ">" + code, x)
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276 self.assertRaises(struct.error, pack, "<" + code, x)
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277
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278 def run(self):
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279 from random import randrange
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280
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281 # Create all interesting powers of 2.
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282 values = []
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283 for exp in range(self.bitsize + 3):
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284 values.append(1 << exp)
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285
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286 # Add some random values.
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287 for i in range(self.bitsize):
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288 val = 0
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289 for j in range(self.bytesize):
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290 val = (val << 8) | randrange(256)
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291 values.append(val)
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292
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293 # Try all those, and their negations, and +-1 from them. Note
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294 # that this tests all power-of-2 boundaries in range, and a few out
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295 # of range, plus +-(2**n +- 1).
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296 for base in values:
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297 for val in -base, base:
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298 for incr in -1, 0, 1:
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299 x = val + incr
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300 try:
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301 x = int(x)
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302 except OverflowError:
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303 pass
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304 self.test_one(x)
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305
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306 # Some error cases.
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307 for direction in "<>":
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308 for code in self.formatpair:
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309 for badobject in "a string", 3+42j, randrange, -1729.0:
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310 self.assertRaises(struct.error,
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311 struct.pack, direction + code,
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312 badobject)
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313
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314 for args in [("bB", 1),
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315 ("hH", 2),
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316 ("iI", 4),
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317 ("lL", 4),
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318 ("qQ", 8)]:
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319 t = IntTester(*args)
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320 t.run()
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321
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322 def test_p_code(self):
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323 # Test p ("Pascal string") code.
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324 for code, input, expected, expectedback in [
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325 ('p','abc', '\x00', b''),
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326 ('1p', 'abc', '\x00', b''),
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327 ('2p', 'abc', '\x01a', b'a'),
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328 ('3p', 'abc', '\x02ab', b'ab'),
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329 ('4p', 'abc', '\x03abc', b'abc'),
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330 ('5p', 'abc', '\x03abc\x00', b'abc'),
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331 ('6p', 'abc', '\x03abc\x00\x00', b'abc'),
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332 ('1000p', 'x'*1000, '\xff' + 'x'*999, b'x'*255)]:
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333 expected = bytes(expected, "latin-1")
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334 got = struct.pack(code, input)
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335 self.assertEqual(got, expected)
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336 (got,) = struct.unpack(code, got)
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337 self.assertEqual(got, expectedback)
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338
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339 def test_705836(self):
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340 # SF bug 705836. "<f" and ">f" had a severe rounding bug, where a carry
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341 # from the low-order discarded bits could propagate into the exponent
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342 # field, causing the result to be wrong by a factor of 2.
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343 import math
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344
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345 for base in range(1, 33):
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346 # smaller <- largest representable float less than base.
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347 delta = 0.5
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348 while base - delta / 2.0 != base:
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349 delta /= 2.0
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350 smaller = base - delta
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351 # Packing this rounds away a solid string of trailing 1 bits.
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352 packed = struct.pack("<f", smaller)
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353 unpacked = struct.unpack("<f", packed)[0]
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354 # This failed at base = 2, 4, and 32, with unpacked = 1, 2, and
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355 # 16, respectively.
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356 self.assertEqual(base, unpacked)
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357 bigpacked = struct.pack(">f", smaller)
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358 self.assertEqual(bigpacked, string_reverse(packed))
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359 unpacked = struct.unpack(">f", bigpacked)[0]
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360 self.assertEqual(base, unpacked)
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361
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362 # Largest finite IEEE single.
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363 big = (1 << 24) - 1
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364 big = math.ldexp(big, 127 - 23)
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365 packed = struct.pack(">f", big)
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366 unpacked = struct.unpack(">f", packed)[0]
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367 self.assertEqual(big, unpacked)
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368
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369 # The same, but tack on a 1 bit so it rounds up to infinity.
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370 big = (1 << 25) - 1
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371 big = math.ldexp(big, 127 - 24)
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372 self.assertRaises(OverflowError, struct.pack, ">f", big)
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373
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374 def test_1229380(self):
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375 # SF bug 1229380. No struct.pack exception for some out of
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376 # range integers
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377 for endian in ('', '>', '<'):
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378 for fmt in ('B', 'H', 'I', 'L'):
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379 self.assertRaises((struct.error, OverflowError), struct.pack,
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380 endian + fmt, -1)
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381
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382 self.assertRaises((struct.error, OverflowError), struct.pack,
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383 endian + 'B', 300)
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384 self.assertRaises((struct.error, OverflowError), struct.pack,
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385 endian + 'H', 70000)
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386
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387 self.assertRaises((struct.error, OverflowError), struct.pack,
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388 endian + 'I', sys.maxsize * 4)
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389 self.assertRaises((struct.error, OverflowError), struct.pack,
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390 endian + 'L', sys.maxsize * 4)
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391
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392 def test_1530559(self):
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393 for endian in ('', '>', '<'):
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394 for fmt in ('B', 'H', 'I', 'L', 'Q', 'b', 'h', 'i', 'l', 'q'):
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395 self.assertRaises(struct.error, struct.pack, endian + fmt, 1.0)
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396 self.assertRaises(struct.error, struct.pack, endian + fmt, 1.5)
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397 self.assertRaises(struct.error, struct.pack, 'P', 1.0)
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398 self.assertRaises(struct.error, struct.pack, 'P', 1.5)
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399
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400
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401 def test_unpack_from(self):
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402 test_string = b'abcd01234'
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403 fmt = '4s'
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404 s = struct.Struct(fmt)
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405 for cls in (bytes, bytearray):
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406 data = cls(test_string)
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407 if not isinstance(data, (bytes, bytearray)):
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408 bytes_data = bytes(data, 'latin1')
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diff changeset
409 else:
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410 bytes_data = data
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411 self.assertEqual(s.unpack_from(data), (b'abcd',))
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412 self.assertEqual(s.unpack_from(data, 2), (b'cd01',))
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413 self.assertEqual(s.unpack_from(data, 4), (b'0123',))
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414 for i in range(6):
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415 self.assertEqual(s.unpack_from(data, i), (bytes_data[i:i+4],))
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416 for i in range(6, len(test_string) + 1):
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417 self.assertRaises(struct.error, s.unpack_from, data, i)
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418 for cls in (bytes, bytearray):
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419 data = cls(test_string)
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420 self.assertEqual(struct.unpack_from(fmt, data), (b'abcd',))
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421 self.assertEqual(struct.unpack_from(fmt, data, 2), (b'cd01',))
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422 self.assertEqual(struct.unpack_from(fmt, data, 4), (b'0123',))
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423 for i in range(6):
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424 self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))
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425 for i in range(6, len(test_string) + 1):
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426 self.assertRaises(struct.error, struct.unpack_from, fmt, data, i)
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427
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428 def test_pack_into(self):
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429 test_string = b'Reykjavik rocks, eow!'
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430 writable_buf = array.array('b', b' '*100)
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431 fmt = '21s'
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432 s = struct.Struct(fmt)
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433
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434 # Test without offset
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435 s.pack_into(writable_buf, 0, test_string)
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436 from_buf = writable_buf.tostring()[:len(test_string)]
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437 self.assertEqual(from_buf, test_string)
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438
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439 # Test with offset.
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440 s.pack_into(writable_buf, 10, test_string)
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441 from_buf = writable_buf.tostring()[:len(test_string)+10]
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442 self.assertEqual(from_buf, test_string[:10] + test_string)
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443
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diff changeset
444 # Go beyond boundaries.
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445 small_buf = array.array('b', b' '*10)
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446 self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 0,
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447 test_string)
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448 self.assertRaises((ValueError, struct.error), s.pack_into, small_buf, 2,
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449 test_string)
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450
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451 # Test bogus offset (issue 3694)
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452 sb = small_buf
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453 self.assertRaises(TypeError, struct.pack_into, b'1', sb, None)
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454
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455 def test_pack_into_fn(self):
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456 test_string = b'Reykjavik rocks, eow!'
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457 writable_buf = array.array('b', b' '*100)
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458 fmt = '21s'
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459 pack_into = lambda *args: struct.pack_into(fmt, *args)
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460
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461 # Test without offset.
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462 pack_into(writable_buf, 0, test_string)
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463 from_buf = writable_buf.tostring()[:len(test_string)]
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464 self.assertEqual(from_buf, test_string)
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465
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466 # Test with offset.
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467 pack_into(writable_buf, 10, test_string)
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468 from_buf = writable_buf.tostring()[:len(test_string)+10]
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469 self.assertEqual(from_buf, test_string[:10] + test_string)
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470
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471 # Go beyond boundaries.
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472 small_buf = array.array('b', b' '*10)
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473 self.assertRaises((ValueError, struct.error), pack_into, small_buf, 0,
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474 test_string)
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475 self.assertRaises((ValueError, struct.error), pack_into, small_buf, 2,
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476 test_string)
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477
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478 def test_unpack_with_buffer(self):
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479 # SF bug 1563759: struct.unpack doens't support buffer protocol objects
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480 data1 = array.array('B', b'\x12\x34\x56\x78')
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481 data2 = memoryview(b'\x12\x34\x56\x78') # XXX b'......XXXX......', 6, 4
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482 for data in [data1, data2]:
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483 value, = struct.unpack('>I', data)
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484 self.assertEqual(value, 0x12345678)
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485
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486 def test_bool(self):
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487 class ExplodingBool(object):
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488 def __bool__(self):
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489 raise IOError
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490 for prefix in tuple("<>!=")+('',):
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491 false = (), [], [], '', 0
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492 true = [1], 'test', 5, -1, 0xffffffff+1, 0xffffffff/2
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493
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494 falseFormat = prefix + '?' * len(false)
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495 packedFalse = struct.pack(falseFormat, *false)
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496 unpackedFalse = struct.unpack(falseFormat, packedFalse)
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497
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498 trueFormat = prefix + '?' * len(true)
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499 packedTrue = struct.pack(trueFormat, *true)
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500 unpackedTrue = struct.unpack(trueFormat, packedTrue)
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501
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502 self.assertEqual(len(true), len(unpackedTrue))
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503 self.assertEqual(len(false), len(unpackedFalse))
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504
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505 for t in unpackedFalse:
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506 self.assertFalse(t)
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507 for t in unpackedTrue:
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508 self.assertTrue(t)
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509
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510 packed = struct.pack(prefix+'?', 1)
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511
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512 self.assertEqual(len(packed), struct.calcsize(prefix+'?'))
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513
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514 if len(packed) != 1:
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515 self.assertFalse(prefix, msg='encoded bool is not one byte: %r'
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516 %packed)
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517
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518 self.assertRaises(IOError, struct.pack, prefix + '?',
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519 ExplodingBool())
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520
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521 for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
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522 self.assertTrue(struct.unpack('>?', c)[0])
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523
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524 def test_count_overflow(self):
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525 hugecount = '{}b'.format(sys.maxsize+1)
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526 self.assertRaises(struct.error, struct.calcsize, hugecount)
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527
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528 hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2)
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529 self.assertRaises(struct.error, struct.calcsize, hugecount2)
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530
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531 if IS32BIT:
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532 def test_crasher(self):
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533 self.assertRaises(MemoryError, struct.pack, "357913941b", "a")
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534
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535
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536 def test_main():
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537 run_unittest(StructTest)
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538
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539 if __name__ == '__main__':
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540 test_main()