Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_file.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 3c9232a684ae
children 9b3c5085b4a4 7d69d04522e3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import sys
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2 import os
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3 import unittest
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4 from array import array
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5 from weakref import proxy
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6
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7 import io
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8 import _pyio as pyio
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9
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10 from test.support import TESTFN, run_unittest
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11 from collections import UserList
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12
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13 class AutoFileTests(unittest.TestCase):
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14 # file tests for which a test file is automatically set up
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15
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16 def setUp(self):
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17 self.f = self.open(TESTFN, 'wb')
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18
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19 def tearDown(self):
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20 if self.f:
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21 self.f.close()
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22 os.remove(TESTFN)
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23
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24 def testWeakRefs(self):
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25 # verify weak references
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26 p = proxy(self.f)
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27 p.write(b'teststring')
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28 self.assertEqual(self.f.tell(), p.tell())
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29 self.f.close()
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30 self.f = None
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31 self.assertRaises(ReferenceError, getattr, p, 'tell')
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32
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33 def testAttributes(self):
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34 # verify expected attributes exist
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35 f = self.f
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36 f.name # merely shouldn't blow up
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37 f.mode # ditto
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38 f.closed # ditto
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39
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40 def testReadinto(self):
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41 # verify readinto
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42 self.f.write(b'12')
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43 self.f.close()
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44 a = array('b', b'x'*10)
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45 self.f = self.open(TESTFN, 'rb')
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46 n = self.f.readinto(a)
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47 self.assertEqual(b'12', a.tobytes()[:n])
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48
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49 def testReadinto_text(self):
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50 # verify readinto refuses text files
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51 a = array('b', b'x'*10)
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52 self.f.close()
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53 self.f = self.open(TESTFN, 'r')
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54 if hasattr(self.f, "readinto"):
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55 self.assertRaises(TypeError, self.f.readinto, a)
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56
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57 def testWritelinesUserList(self):
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58 # verify writelines with instance sequence
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59 l = UserList([b'1', b'2'])
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60 self.f.writelines(l)
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61 self.f.close()
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62 self.f = self.open(TESTFN, 'rb')
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63 buf = self.f.read()
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64 self.assertEqual(buf, b'12')
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65
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66 def testWritelinesIntegers(self):
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67 # verify writelines with integers
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68 self.assertRaises(TypeError, self.f.writelines, [1, 2, 3])
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69
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70 def testWritelinesIntegersUserList(self):
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71 # verify writelines with integers in UserList
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72 l = UserList([1,2,3])
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73 self.assertRaises(TypeError, self.f.writelines, l)
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74
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75 def testWritelinesNonString(self):
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76 # verify writelines with non-string object
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77 class NonString:
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78 pass
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79
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80 self.assertRaises(TypeError, self.f.writelines,
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81 [NonString(), NonString()])
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82
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83 def testErrors(self):
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84 f = self.f
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85 self.assertEqual(f.name, TESTFN)
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86 self.assertTrue(not f.isatty())
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87 self.assertTrue(not f.closed)
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88
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89 if hasattr(f, "readinto"):
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90 self.assertRaises((IOError, TypeError), f.readinto, "")
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91 f.close()
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92 self.assertTrue(f.closed)
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93
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94 def testMethods(self):
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95 methods = [('fileno', ()),
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96 ('flush', ()),
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97 ('isatty', ()),
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98 ('__next__', ()),
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99 ('read', ()),
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100 ('write', (b"",)),
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101 ('readline', ()),
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102 ('readlines', ()),
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103 ('seek', (0,)),
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104 ('tell', ()),
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105 ('write', (b"",)),
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106 ('writelines', ([],)),
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107 ('__iter__', ()),
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108 ]
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109 methods.append(('truncate', ()))
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110
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111 # __exit__ should close the file
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112 self.f.__exit__(None, None, None)
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113 self.assertTrue(self.f.closed)
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114
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115 for methodname, args in methods:
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116 method = getattr(self.f, methodname)
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117 # should raise on closed file
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118 self.assertRaises(ValueError, method, *args)
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119
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120 # file is closed, __exit__ shouldn't do anything
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121 self.assertEqual(self.f.__exit__(None, None, None), None)
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122 # it must also return None if an exception was given
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123 try:
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124 1/0
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125 except:
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126 self.assertEqual(self.f.__exit__(*sys.exc_info()), None)
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127
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128 def testReadWhenWriting(self):
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129 self.assertRaises(IOError, self.f.read)
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130
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131 class CAutoFileTests(AutoFileTests):
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132 open = io.open
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133
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134 class PyAutoFileTests(AutoFileTests):
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135 open = staticmethod(pyio.open)
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136
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137
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138 class OtherFileTests(unittest.TestCase):
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139
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140 def testModeStrings(self):
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141 # check invalid mode strings
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142 for mode in ("", "aU", "wU+"):
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143 try:
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144 f = self.open(TESTFN, mode)
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145 except ValueError:
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146 pass
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147 else:
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148 f.close()
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149 self.fail('%r is an invalid file mode' % mode)
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150
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151 def testStdin(self):
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152 # This causes the interpreter to exit on OSF1 v5.1.
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153 if sys.platform != 'osf1V5':
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154 self.assertRaises((IOError, ValueError), sys.stdin.seek, -1)
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155 else:
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156 print((
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157 ' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
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158 ' Test manually.'), file=sys.__stdout__)
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159 self.assertRaises((IOError, ValueError), sys.stdin.truncate)
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160
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161 def testBadModeArgument(self):
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162 # verify that we get a sensible error message for bad mode argument
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163 bad_mode = "qwerty"
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164 try:
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165 f = self.open(TESTFN, bad_mode)
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166 except ValueError as msg:
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167 if msg.args[0] != 0:
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168 s = str(msg)
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169 if TESTFN in s or bad_mode not in s:
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170 self.fail("bad error message for invalid mode: %s" % s)
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171 # if msg.args[0] == 0, we're probably on Windows where there may be
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172 # no obvious way to discover why open() failed.
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173 else:
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174 f.close()
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175 self.fail("no error for invalid mode: %s" % bad_mode)
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176
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177 def testSetBufferSize(self):
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178 # make sure that explicitly setting the buffer size doesn't cause
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179 # misbehaviour especially with repeated close() calls
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180 for s in (-1, 0, 1, 512):
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181 try:
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182 f = self.open(TESTFN, 'wb', s)
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183 f.write(str(s).encode("ascii"))
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184 f.close()
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185 f.close()
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186 f = self.open(TESTFN, 'rb', s)
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187 d = int(f.read().decode("ascii"))
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188 f.close()
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189 f.close()
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190 except IOError as msg:
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191 self.fail('error setting buffer size %d: %s' % (s, str(msg)))
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192 self.assertEqual(d, s)
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193
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194 def testTruncateOnWindows(self):
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195 # SF bug <http://www.python.org/sf/801631>
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196 # "file.truncate fault on windows"
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197
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198 os.unlink(TESTFN)
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199 f = self.open(TESTFN, 'wb')
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200
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201 try:
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202 f.write(b'12345678901') # 11 bytes
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203 f.close()
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204
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205 f = self.open(TESTFN,'rb+')
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206 data = f.read(5)
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207 if data != b'12345':
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208 self.fail("Read on file opened for update failed %r" % data)
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209 if f.tell() != 5:
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210 self.fail("File pos after read wrong %d" % f.tell())
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211
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212 f.truncate()
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213 if f.tell() != 5:
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214 self.fail("File pos after ftruncate wrong %d" % f.tell())
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215
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216 f.close()
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217 size = os.path.getsize(TESTFN)
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218 if size != 5:
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219 self.fail("File size after ftruncate wrong %d" % size)
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220 finally:
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221 f.close()
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222 os.unlink(TESTFN)
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223
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224 def testIteration(self):
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225 # Test the complex interaction when mixing file-iteration and the
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226 # various read* methods.
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227 dataoffset = 16384
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228 filler = b"ham\n"
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229 assert not dataoffset % len(filler), \
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230 "dataoffset must be multiple of len(filler)"
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231 nchunks = dataoffset // len(filler)
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232 testlines = [
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233 b"spam, spam and eggs\n",
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234 b"eggs, spam, ham and spam\n",
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235 b"saussages, spam, spam and eggs\n",
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236 b"spam, ham, spam and eggs\n",
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237 b"spam, spam, spam, spam, spam, ham, spam\n",
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238 b"wonderful spaaaaaam.\n"
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239 ]
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240 methods = [("readline", ()), ("read", ()), ("readlines", ()),
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241 ("readinto", (array("b", b" "*100),))]
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242
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243 try:
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244 # Prepare the testfile
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245 bag = self.open(TESTFN, "wb")
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246 bag.write(filler * nchunks)
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247 bag.writelines(testlines)
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248 bag.close()
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249 # Test for appropriate errors mixing read* and iteration
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250 for methodname, args in methods:
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251 f = self.open(TESTFN, 'rb')
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252 if next(f) != filler:
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253 self.fail, "Broken testfile"
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254 meth = getattr(f, methodname)
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255 meth(*args) # This simply shouldn't fail
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256 f.close()
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257
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258 # Test to see if harmless (by accident) mixing of read* and
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259 # iteration still works. This depends on the size of the internal
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260 # iteration buffer (currently 8192,) but we can test it in a
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261 # flexible manner. Each line in the bag o' ham is 4 bytes
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262 # ("h", "a", "m", "\n"), so 4096 lines of that should get us
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263 # exactly on the buffer boundary for any power-of-2 buffersize
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264 # between 4 and 16384 (inclusive).
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265 f = self.open(TESTFN, 'rb')
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266 for i in range(nchunks):
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267 next(f)
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268 testline = testlines.pop(0)
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269 try:
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270 line = f.readline()
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271 except ValueError:
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272 self.fail("readline() after next() with supposedly empty "
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273 "iteration-buffer failed anyway")
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274 if line != testline:
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275 self.fail("readline() after next() with empty buffer "
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276 "failed. Got %r, expected %r" % (line, testline))
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277 testline = testlines.pop(0)
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278 buf = array("b", b"\x00" * len(testline))
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279 try:
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280 f.readinto(buf)
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281 except ValueError:
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282 self.fail("readinto() after next() with supposedly empty "
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283 "iteration-buffer failed anyway")
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284 line = buf.tobytes()
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285 if line != testline:
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286 self.fail("readinto() after next() with empty buffer "
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287 "failed. Got %r, expected %r" % (line, testline))
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288
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289 testline = testlines.pop(0)
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290 try:
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291 line = f.read(len(testline))
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292 except ValueError:
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293 self.fail("read() after next() with supposedly empty "
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294 "iteration-buffer failed anyway")
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295 if line != testline:
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296 self.fail("read() after next() with empty buffer "
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297 "failed. Got %r, expected %r" % (line, testline))
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298 try:
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299 lines = f.readlines()
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300 except ValueError:
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301 self.fail("readlines() after next() with supposedly empty "
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302 "iteration-buffer failed anyway")
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303 if lines != testlines:
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304 self.fail("readlines() after next() with empty buffer "
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305 "failed. Got %r, expected %r" % (line, testline))
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306 f.close()
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307
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308 # Reading after iteration hit EOF shouldn't hurt either
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309 f = self.open(TESTFN, 'rb')
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310 try:
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311 for line in f:
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312 pass
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313 try:
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314 f.readline()
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315 f.readinto(buf)
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316 f.read()
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317 f.readlines()
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318 except ValueError:
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319 self.fail("read* failed after next() consumed file")
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320 finally:
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321 f.close()
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322 finally:
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323 os.unlink(TESTFN)
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324
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325 class COtherFileTests(OtherFileTests):
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326 open = io.open
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327
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328 class PyOtherFileTests(OtherFileTests):
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329 open = staticmethod(pyio.open)
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330
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331
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332 def test_main():
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333 # Historically, these tests have been sloppy about removing TESTFN.
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334 # So get rid of it no matter what.
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335 try:
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336 run_unittest(CAutoFileTests, PyAutoFileTests,
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337 COtherFileTests, PyOtherFileTests)
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338 finally:
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339 if os.path.exists(TESTFN):
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340 os.unlink(TESTFN)
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341
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342 if __name__ == '__main__':
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343 test_main()