Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_file.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents b36cb4602e21
children 17542d36effd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # NOTE: this file tests the new `io` library backported from Python 3.x.
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2 # Similar tests for the builtin file object can be found in test_file2k.py.
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3
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4 from __future__ import print_function
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5
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6 import sys
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7 import os
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8 import unittest
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9 from array import array
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10 from weakref import proxy
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11
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12 import io
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13 import _pyio as pyio
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14
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15 from test.test_support import TESTFN, run_unittest
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16 from UserList import UserList
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17
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18 class AutoFileTests(unittest.TestCase):
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19 # file tests for which a test file is automatically set up
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20
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21 def setUp(self):
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22 self.f = self.open(TESTFN, 'wb')
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23
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24 def tearDown(self):
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25 if self.f:
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26 self.f.close()
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27 os.remove(TESTFN)
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28
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29 def testWeakRefs(self):
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30 # verify weak references
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31 p = proxy(self.f)
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32 p.write(b'teststring')
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33 self.assertEqual(self.f.tell(), p.tell())
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34 self.f.close()
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35 self.f = None
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36 self.assertRaises(ReferenceError, getattr, p, 'tell')
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37
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38 def testAttributes(self):
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39 # verify expected attributes exist
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40 f = self.f
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41 f.name # merely shouldn't blow up
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42 f.mode # ditto
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43 f.closed # ditto
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44
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45 def testReadinto(self):
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46 # verify readinto
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47 self.f.write(b'12')
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48 self.f.close()
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49 a = array('b', b'x'*10)
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50 self.f = self.open(TESTFN, 'rb')
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51 n = self.f.readinto(a)
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52 self.assertEqual(b'12', a.tostring()[:n])
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53
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54 def testReadinto_text(self):
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55 # verify readinto refuses text files
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56 a = array('b', b'x'*10)
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57 self.f.close()
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58 self.f = self.open(TESTFN, 'r')
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59 if hasattr(self.f, "readinto"):
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60 self.assertRaises(TypeError, self.f.readinto, a)
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61
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62 def testWritelinesUserList(self):
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63 # verify writelines with instance sequence
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64 l = UserList([b'1', b'2'])
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65 self.f.writelines(l)
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66 self.f.close()
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67 self.f = self.open(TESTFN, 'rb')
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68 buf = self.f.read()
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69 self.assertEqual(buf, b'12')
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70
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71 def testWritelinesIntegers(self):
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72 # verify writelines with integers
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73 self.assertRaises(TypeError, self.f.writelines, [1, 2, 3])
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74
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75 def testWritelinesIntegersUserList(self):
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76 # verify writelines with integers in UserList
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77 l = UserList([1,2,3])
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78 self.assertRaises(TypeError, self.f.writelines, l)
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79
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80 def testWritelinesNonString(self):
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81 # verify writelines with non-string object
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82 class NonString:
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83 pass
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84
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85 self.assertRaises(TypeError, self.f.writelines,
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86 [NonString(), NonString()])
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87
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88 def testErrors(self):
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89 f = self.f
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90 self.assertEqual(f.name, TESTFN)
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91 self.assertTrue(not f.isatty())
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92 self.assertTrue(not f.closed)
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93
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94 if hasattr(f, "readinto"):
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95 self.assertRaises((IOError, TypeError), f.readinto, "")
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96 f.close()
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97 self.assertTrue(f.closed)
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98
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99 def testMethods(self):
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100 methods = [('fileno', ()),
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101 ('flush', ()),
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102 ('isatty', ()),
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103 ('next', ()),
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104 ('read', ()),
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105 ('write', (b"",)),
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106 ('readline', ()),
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107 ('readlines', ()),
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108 ('seek', (0,)),
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109 ('tell', ()),
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110 ('write', (b"",)),
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111 ('writelines', ([],)),
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112 ('__iter__', ()),
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113 ]
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114 if not sys.platform.startswith('atheos'):
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115 methods.append(('truncate', ()))
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116
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117 # __exit__ should close the file
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118 self.f.__exit__(None, None, None)
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119 self.assertTrue(self.f.closed)
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120
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121 for methodname, args in methods:
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122 method = getattr(self.f, methodname)
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123 # should raise on closed file
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124 self.assertRaises(ValueError, method, *args)
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125
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126 # file is closed, __exit__ shouldn't do anything
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127 self.assertEqual(self.f.__exit__(None, None, None), None)
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128 # it must also return None if an exception was given
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129 try:
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130 1 // 0
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131 except:
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132 self.assertEqual(self.f.__exit__(*sys.exc_info()), None)
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133
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134 def testReadWhenWriting(self):
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135 self.assertRaises(IOError, self.f.read)
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136
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137 class CAutoFileTests(AutoFileTests):
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138 open = io.open
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139
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140 class PyAutoFileTests(AutoFileTests):
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141 open = staticmethod(pyio.open)
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142
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143
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144 class OtherFileTests(unittest.TestCase):
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145
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146 def testModeStrings(self):
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147 # check invalid mode strings
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148 for mode in ("", "aU", "wU+"):
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149 try:
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150 f = self.open(TESTFN, mode)
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151 except ValueError:
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152 pass
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153 else:
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154 f.close()
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155 self.fail('%r is an invalid file mode' % mode)
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156
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157 def testStdin(self):
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158 # This causes the interpreter to exit on OSF1 v5.1.
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159 if sys.platform != 'osf1V5':
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160 self.assertRaises((IOError, ValueError), sys.stdin.seek, -1)
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161 else:
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162 print((
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163 ' Skipping sys.stdin.seek(-1), it may crash the interpreter.'
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164 ' Test manually.'), file=sys.__stdout__)
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165 self.assertRaises((IOError, ValueError), sys.stdin.truncate)
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166
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167 def testBadModeArgument(self):
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168 # verify that we get a sensible error message for bad mode argument
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169 bad_mode = "qwerty"
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170 try:
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171 f = self.open(TESTFN, bad_mode)
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172 except ValueError as msg:
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173 if msg.args[0] != 0:
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174 s = str(msg)
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175 if TESTFN in s or bad_mode not in s:
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176 self.fail("bad error message for invalid mode: %s" % s)
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177 # if msg.args[0] == 0, we're probably on Windows where there may be
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178 # no obvious way to discover why open() failed.
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179 else:
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180 f.close()
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181 self.fail("no error for invalid mode: %s" % bad_mode)
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182
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183 def testSetBufferSize(self):
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184 # make sure that explicitly setting the buffer size doesn't cause
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185 # misbehaviour especially with repeated close() calls
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186 for s in (-1, 0, 1, 512):
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187 try:
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188 f = self.open(TESTFN, 'wb', s)
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189 f.write(str(s).encode("ascii"))
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190 f.close()
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191 f.close()
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192 f = self.open(TESTFN, 'rb', s)
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193 d = int(f.read().decode("ascii"))
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194 f.close()
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195 f.close()
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196 except IOError as msg:
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197 self.fail('error setting buffer size %d: %s' % (s, str(msg)))
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198 self.assertEqual(d, s)
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199
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200 def testTruncateOnWindows(self):
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201 # SF bug <http://www.python.org/sf/801631>
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202 # "file.truncate fault on windows"
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203
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204 os.unlink(TESTFN)
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205 f = self.open(TESTFN, 'wb')
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206
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207 try:
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208 f.write(b'12345678901') # 11 bytes
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209 f.close()
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210
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211 f = self.open(TESTFN,'rb+')
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212 data = f.read(5)
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213 if data != b'12345':
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214 self.fail("Read on file opened for update failed %r" % data)
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215 if f.tell() != 5:
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216 self.fail("File pos after read wrong %d" % f.tell())
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217
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218 f.truncate()
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219 if f.tell() != 5:
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220 self.fail("File pos after ftruncate wrong %d" % f.tell())
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221
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222 f.close()
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223 size = os.path.getsize(TESTFN)
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224 if size != 5:
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225 self.fail("File size after ftruncate wrong %d" % size)
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226 finally:
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227 f.close()
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228 os.unlink(TESTFN)
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229
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230 def testIteration(self):
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231 # Test the complex interaction when mixing file-iteration and the
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232 # various read* methods.
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233 dataoffset = 16384
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234 filler = b"ham\n"
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235 assert not dataoffset % len(filler), \
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236 "dataoffset must be multiple of len(filler)"
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237 nchunks = dataoffset // len(filler)
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238 testlines = [
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239 b"spam, spam and eggs\n",
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240 b"eggs, spam, ham and spam\n",
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241 b"saussages, spam, spam and eggs\n",
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242 b"spam, ham, spam and eggs\n",
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243 b"spam, spam, spam, spam, spam, ham, spam\n",
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244 b"wonderful spaaaaaam.\n"
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245 ]
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246 methods = [("readline", ()), ("read", ()), ("readlines", ()),
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247 ("readinto", (array("b", b" "*100),))]
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248
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249 try:
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250 # Prepare the testfile
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251 bag = self.open(TESTFN, "wb")
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252 bag.write(filler * nchunks)
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253 bag.writelines(testlines)
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254 bag.close()
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255 # Test for appropriate errors mixing read* and iteration
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256 for methodname, args in methods:
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257 f = self.open(TESTFN, 'rb')
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258 if next(f) != filler:
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259 self.fail, "Broken testfile"
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260 meth = getattr(f, methodname)
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261 meth(*args) # This simply shouldn't fail
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262 f.close()
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263
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264 # Test to see if harmless (by accident) mixing of read* and
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265 # iteration still works. This depends on the size of the internal
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266 # iteration buffer (currently 8192,) but we can test it in a
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267 # flexible manner. Each line in the bag o' ham is 4 bytes
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268 # ("h", "a", "m", "\n"), so 4096 lines of that should get us
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269 # exactly on the buffer boundary for any power-of-2 buffersize
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270 # between 4 and 16384 (inclusive).
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271 f = self.open(TESTFN, 'rb')
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272 for i in range(nchunks):
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273 next(f)
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274 testline = testlines.pop(0)
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275 try:
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276 line = f.readline()
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277 except ValueError:
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278 self.fail("readline() after next() with supposedly empty "
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279 "iteration-buffer failed anyway")
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280 if line != testline:
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281 self.fail("readline() after next() with empty buffer "
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282 "failed. Got %r, expected %r" % (line, testline))
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283 testline = testlines.pop(0)
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284 buf = array("b", b"\x00" * len(testline))
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285 try:
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286 f.readinto(buf)
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287 except ValueError:
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288 self.fail("readinto() after next() with supposedly empty "
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289 "iteration-buffer failed anyway")
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290 line = buf.tostring()
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291 if line != testline:
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292 self.fail("readinto() after next() with empty buffer "
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293 "failed. Got %r, expected %r" % (line, testline))
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294
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295 testline = testlines.pop(0)
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296 try:
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297 line = f.read(len(testline))
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298 except ValueError:
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299 self.fail("read() after next() with supposedly empty "
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300 "iteration-buffer failed anyway")
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301 if line != testline:
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302 self.fail("read() after next() with empty buffer "
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303 "failed. Got %r, expected %r" % (line, testline))
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304 try:
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305 lines = f.readlines()
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306 except ValueError:
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307 self.fail("readlines() after next() with supposedly empty "
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308 "iteration-buffer failed anyway")
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309 if lines != testlines:
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310 self.fail("readlines() after next() with empty buffer "
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311 "failed. Got %r, expected %r" % (line, testline))
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312 # Reading after iteration hit EOF shouldn't hurt either
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313 f = self.open(TESTFN, 'rb')
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314 try:
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315 for line in f:
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316 pass
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317 try:
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318 f.readline()
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319 f.readinto(buf)
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320 f.read()
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321 f.readlines()
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322 except ValueError:
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323 self.fail("read* failed after next() consumed file")
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324 finally:
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325 f.close()
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326 finally:
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327 os.unlink(TESTFN)
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328
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329 class COtherFileTests(OtherFileTests):
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330 open = io.open
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86da9298b908 Make file objects as thread safe as the underlying libc FILE* implementation.
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331
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332 class PyOtherFileTests(OtherFileTests):
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333 open = staticmethod(pyio.open)
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334
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60fd0886811c #3242: fix a crash in "print", if sys.stdout is set to a custom object,
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335
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336 def test_main():
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337 # Historically, these tests have been sloppy about removing TESTFN.
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338 # So get rid of it no matter what.
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339 try:
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340 run_unittest(CAutoFileTests, PyAutoFileTests,
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341 COtherFileTests, PyOtherFileTests)
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342 finally:
eca4fe132940 testUnicodeOpen(): I have no idea why, but making this
Tim Peters <tim.peters@gmail.com>
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343 if os.path.exists(TESTFN):
eca4fe132940 testUnicodeOpen(): I have no idea why, but making this
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344 os.unlink(TESTFN)
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345
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346 if __name__ == '__main__':
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347 test_main()