Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_pkgutil.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 17b5afd321a8
children
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1 from test.test_support import run_unittest
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2 import unittest
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3 import sys
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4 import imp
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5 import pkgutil
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6 import os
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7 import os.path
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8 import tempfile
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9 import shutil
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10 import zipfile
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11
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12
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13
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14 class PkgutilTests(unittest.TestCase):
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15
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16 def setUp(self):
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17 self.dirname = tempfile.mkdtemp()
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18 self.addCleanup(shutil.rmtree, self.dirname)
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19 sys.path.insert(0, self.dirname)
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20
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21 def tearDown(self):
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22 del sys.path[0]
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23
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24 def test_getdata_filesys(self):
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25 pkg = 'test_getdata_filesys'
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26
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27 # Include a LF and a CRLF, to test that binary data is read back
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28 RESOURCE_DATA = 'Hello, world!\nSecond line\r\nThird line'
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29
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30 # Make a package with some resources
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31 package_dir = os.path.join(self.dirname, pkg)
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32 os.mkdir(package_dir)
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33 # Empty init.py
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34 f = open(os.path.join(package_dir, '__init__.py'), "wb")
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35 f.close()
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36 # Resource files, res.txt, sub/res.txt
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37 f = open(os.path.join(package_dir, 'res.txt'), "wb")
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38 f.write(RESOURCE_DATA)
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39 f.close()
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40 os.mkdir(os.path.join(package_dir, 'sub'))
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41 f = open(os.path.join(package_dir, 'sub', 'res.txt'), "wb")
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42 f.write(RESOURCE_DATA)
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43 f.close()
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44
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45 # Check we can read the resources
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46 res1 = pkgutil.get_data(pkg, 'res.txt')
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47 self.assertEqual(res1, RESOURCE_DATA)
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48 res2 = pkgutil.get_data(pkg, 'sub/res.txt')
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49 self.assertEqual(res2, RESOURCE_DATA)
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50
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51 del sys.modules[pkg]
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52
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53 def test_getdata_zipfile(self):
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54 zip = 'test_getdata_zipfile.zip'
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55 pkg = 'test_getdata_zipfile'
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56
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57 # Include a LF and a CRLF, to test that binary data is read back
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58 RESOURCE_DATA = 'Hello, world!\nSecond line\r\nThird line'
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59
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60 # Make a package with some resources
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61 zip_file = os.path.join(self.dirname, zip)
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62 z = zipfile.ZipFile(zip_file, 'w')
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63
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64 # Empty init.py
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65 z.writestr(pkg + '/__init__.py', "")
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66 # Resource files, res.txt, sub/res.txt
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67 z.writestr(pkg + '/res.txt', RESOURCE_DATA)
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68 z.writestr(pkg + '/sub/res.txt', RESOURCE_DATA)
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69 z.close()
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70
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71 # Check we can read the resources
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72 sys.path.insert(0, zip_file)
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73 res1 = pkgutil.get_data(pkg, 'res.txt')
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74 self.assertEqual(res1, RESOURCE_DATA)
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75 res2 = pkgutil.get_data(pkg, 'sub/res.txt')
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76 self.assertEqual(res2, RESOURCE_DATA)
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77 del sys.path[0]
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78
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79 del sys.modules[pkg]
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80
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81 def test_unreadable_dir_on_syspath(self):
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82 # issue7367 - walk_packages failed if unreadable dir on sys.path
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83 package_name = "unreadable_package"
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84 d = os.path.join(self.dirname, package_name)
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85 # this does not appear to create an unreadable dir on Windows
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86 # but the test should not fail anyway
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87 os.mkdir(d, 0)
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88 self.addCleanup(os.rmdir, d)
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89 for t in pkgutil.walk_packages(path=[self.dirname]):
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90 self.fail("unexpected package found")
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91
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92 class PkgutilPEP302Tests(unittest.TestCase):
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93
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94 class MyTestLoader(object):
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95 def load_module(self, fullname):
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96 # Create an empty module
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97 mod = sys.modules.setdefault(fullname, imp.new_module(fullname))
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98 mod.__file__ = "<%s>" % self.__class__.__name__
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99 mod.__loader__ = self
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100 # Make it a package
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101 mod.__path__ = []
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102 # Count how many times the module is reloaded
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103 mod.__dict__['loads'] = mod.__dict__.get('loads',0) + 1
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104 return mod
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105
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106 def get_data(self, path):
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107 return "Hello, world!"
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108
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109 class MyTestImporter(object):
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110 def find_module(self, fullname, path=None):
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111 return PkgutilPEP302Tests.MyTestLoader()
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112
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113 def setUp(self):
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114 sys.meta_path.insert(0, self.MyTestImporter())
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115
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116 def tearDown(self):
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117 del sys.meta_path[0]
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118
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119 def test_getdata_pep302(self):
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120 # Use a dummy importer/loader
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121 self.assertEqual(pkgutil.get_data('foo', 'dummy'), "Hello, world!")
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122 del sys.modules['foo']
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123
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124 def test_alreadyloaded(self):
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125 # Ensure that get_data works without reloading - the "loads" module
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126 # variable in the example loader should count how many times a reload
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127 # occurs.
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128 import foo
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129 self.assertEqual(foo.loads, 1)
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130 self.assertEqual(pkgutil.get_data('foo', 'dummy'), "Hello, world!")
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131 self.assertEqual(foo.loads, 1)
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132 del sys.modules['foo']
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133
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134 def test_main():
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135 run_unittest(PkgutilTests, PkgutilPEP302Tests)
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136 # this is necessary if test is run repeated (like when finding leaks)
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137 import zipimport
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138 zipimport._zip_directory_cache.clear()
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139
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140 if __name__ == '__main__':
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141 test_main()