Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_pkgutil.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents 16e50e85d684
children c40b50d65a00
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78107
3987667bf98f Take the first step in resolving the messy pkgutil vs importlib edge cases by basing pkgutil explicitly on importlib, deprecating its internal import emulation and setting __main__.__loader__ correctly so that runpy still works (Affects #15343, #15314, #15357)
Nick Coghlan <ncoghlan@gmail.com>
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1 from test.support import run_unittest, unload, check_warnings
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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 # Note: pkgutil.walk_packages is currently tested in test_runpy. This is
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13 # a hack to get a major issue resolved for 3.3b2. Longer term, it should
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14 # be moved back here, perhaps by factoring out the helper code for
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15 # creating interesting package layouts to a separate module.
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16 # Issue #15348 declares this is indeed a dodgy hack ;)
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18 class PkgutilTests(unittest.TestCase):
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20 def setUp(self):
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21 self.dirname = tempfile.mkdtemp()
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22 self.addCleanup(shutil.rmtree, self.dirname)
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23 sys.path.insert(0, self.dirname)
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25 def tearDown(self):
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26 del sys.path[0]
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28 def test_getdata_filesys(self):
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29 pkg = 'test_getdata_filesys'
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31 # Include a LF and a CRLF, to test that binary data is read back
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32 RESOURCE_DATA = b'Hello, world!\nSecond line\r\nThird line'
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34 # Make a package with some resources
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35 package_dir = os.path.join(self.dirname, pkg)
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36 os.mkdir(package_dir)
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37 # Empty init.py
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38 f = open(os.path.join(package_dir, '__init__.py'), "wb")
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39 f.close()
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40 # Resource files, res.txt, sub/res.txt
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41 f = open(os.path.join(package_dir, 'res.txt'), "wb")
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42 f.write(RESOURCE_DATA)
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43 f.close()
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44 os.mkdir(os.path.join(package_dir, 'sub'))
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45 f = open(os.path.join(package_dir, 'sub', 'res.txt'), "wb")
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46 f.write(RESOURCE_DATA)
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47 f.close()
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48
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49 # Check we can read the resources
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50 res1 = pkgutil.get_data(pkg, 'res.txt')
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51 self.assertEqual(res1, RESOURCE_DATA)
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52 res2 = pkgutil.get_data(pkg, 'sub/res.txt')
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53 self.assertEqual(res2, RESOURCE_DATA)
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55 del sys.modules[pkg]
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56
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57 def test_getdata_zipfile(self):
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58 zip = 'test_getdata_zipfile.zip'
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59 pkg = 'test_getdata_zipfile'
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61 # Include a LF and a CRLF, to test that binary data is read back
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62 RESOURCE_DATA = b'Hello, world!\nSecond line\r\nThird line'
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64 # Make a package with some resources
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65 zip_file = os.path.join(self.dirname, zip)
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66 z = zipfile.ZipFile(zip_file, 'w')
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68 # Empty init.py
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69 z.writestr(pkg + '/__init__.py', "")
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70 # Resource files, res.txt, sub/res.txt
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71 z.writestr(pkg + '/res.txt', RESOURCE_DATA)
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72 z.writestr(pkg + '/sub/res.txt', RESOURCE_DATA)
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73 z.close()
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75 # Check we can read the resources
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76 sys.path.insert(0, zip_file)
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77 res1 = pkgutil.get_data(pkg, 'res.txt')
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78 self.assertEqual(res1, RESOURCE_DATA)
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79 res2 = pkgutil.get_data(pkg, 'sub/res.txt')
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80 self.assertEqual(res2, RESOURCE_DATA)
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81
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82 names = []
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83 for loader, name, ispkg in pkgutil.iter_modules([zip_file]):
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84 names.append(name)
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85 self.assertEqual(names, ['test_getdata_zipfile'])
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86
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87 del sys.path[0]
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88
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89 del sys.modules[pkg]
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90
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91 def test_unreadable_dir_on_syspath(self):
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92 # issue7367 - walk_packages failed if unreadable dir on sys.path
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93 package_name = "unreadable_package"
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94 d = os.path.join(self.dirname, package_name)
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95 # this does not appear to create an unreadable dir on Windows
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96 # but the test should not fail anyway
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97 os.mkdir(d, 0)
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98 self.addCleanup(os.rmdir, d)
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99 for t in pkgutil.walk_packages(path=[self.dirname]):
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100 self.fail("unexpected package found")
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101
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102 class PkgutilPEP302Tests(unittest.TestCase):
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103
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104 class MyTestLoader(object):
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105 def load_module(self, fullname):
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106 # Create an empty module
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107 mod = sys.modules.setdefault(fullname, imp.new_module(fullname))
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108 mod.__file__ = "<%s>" % self.__class__.__name__
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109 mod.__loader__ = self
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110 # Make it a package
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111 mod.__path__ = []
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112 # Count how many times the module is reloaded
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113 mod.__dict__['loads'] = mod.__dict__.get('loads',0) + 1
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114 return mod
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115
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116 def get_data(self, path):
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117 return "Hello, world!"
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118
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119 class MyTestImporter(object):
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120 def find_module(self, fullname, path=None):
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121 return PkgutilPEP302Tests.MyTestLoader()
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122
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123 def setUp(self):
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124 sys.meta_path.insert(0, self.MyTestImporter())
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125
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126 def tearDown(self):
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127 del sys.meta_path[0]
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128
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129 def test_getdata_pep302(self):
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130 # Use a dummy importer/loader
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131 self.assertEqual(pkgutil.get_data('foo', 'dummy'), "Hello, world!")
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132 del sys.modules['foo']
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133
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134 def test_alreadyloaded(self):
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135 # Ensure that get_data works without reloading - the "loads" module
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136 # variable in the example loader should count how many times a reload
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137 # occurs.
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138 import foo
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139 self.assertEqual(foo.loads, 1)
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140 self.assertEqual(pkgutil.get_data('foo', 'dummy'), "Hello, world!")
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141 self.assertEqual(foo.loads, 1)
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142 del sys.modules['foo']
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143
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144
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145 # These tests, especially the setup and cleanup, are hideous. They
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146 # need to be cleaned up once issue 14715 is addressed.
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147 class ExtendPathTests(unittest.TestCase):
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148 def create_init(self, pkgname):
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149 dirname = tempfile.mkdtemp()
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150 sys.path.insert(0, dirname)
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151
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152 pkgdir = os.path.join(dirname, pkgname)
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153 os.mkdir(pkgdir)
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154 with open(os.path.join(pkgdir, '__init__.py'), 'w') as fl:
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155 fl.write('from pkgutil import extend_path\n__path__ = extend_path(__path__, __name__)\n')
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156
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157 return dirname
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158
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159 def create_submodule(self, dirname, pkgname, submodule_name, value):
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160 module_name = os.path.join(dirname, pkgname, submodule_name + '.py')
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161 with open(module_name, 'w') as fl:
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162 print('value={}'.format(value), file=fl)
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163
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164 def test_simple(self):
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165 pkgname = 'foo'
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166 dirname_0 = self.create_init(pkgname)
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167 dirname_1 = self.create_init(pkgname)
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168 self.create_submodule(dirname_0, pkgname, 'bar', 0)
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169 self.create_submodule(dirname_1, pkgname, 'baz', 1)
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170 import foo.bar
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171 import foo.baz
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172 # Ensure we read the expected values
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173 self.assertEqual(foo.bar.value, 0)
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174 self.assertEqual(foo.baz.value, 1)
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175
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176 # Ensure the path is set up correctly
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177 self.assertEqual(sorted(foo.__path__),
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178 sorted([os.path.join(dirname_0, pkgname),
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179 os.path.join(dirname_1, pkgname)]))
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180
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181 # Cleanup
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182 shutil.rmtree(dirname_0)
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183 shutil.rmtree(dirname_1)
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184 del sys.path[0]
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185 del sys.path[0]
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186 del sys.modules['foo']
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187 del sys.modules['foo.bar']
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188 del sys.modules['foo.baz']
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189
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190 def test_mixed_namespace(self):
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191 pkgname = 'foo'
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192 dirname_0 = self.create_init(pkgname)
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193 dirname_1 = self.create_init(pkgname)
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194 self.create_submodule(dirname_0, pkgname, 'bar', 0)
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195 # Turn this into a PEP 420 namespace package
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196 os.unlink(os.path.join(dirname_0, pkgname, '__init__.py'))
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197 self.create_submodule(dirname_1, pkgname, 'baz', 1)
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198 import foo.bar
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199 import foo.baz
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200 # Ensure we read the expected values
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201 self.assertEqual(foo.bar.value, 0)
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202 self.assertEqual(foo.baz.value, 1)
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203
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204 # Ensure the path is set up correctly
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205 self.assertEqual(sorted(foo.__path__),
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206 sorted([os.path.join(dirname_0, pkgname),
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207 os.path.join(dirname_1, pkgname)]))
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208
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209 # Cleanup
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210 shutil.rmtree(dirname_0)
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211 shutil.rmtree(dirname_1)
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212 del sys.path[0]
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213 del sys.path[0]
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214 del sys.modules['foo']
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215 del sys.modules['foo.bar']
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216 del sys.modules['foo.baz']
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217
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218 # XXX: test .pkg files
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219
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220
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221 class NestedNamespacePackageTest(unittest.TestCase):
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222
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223 def setUp(self):
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224 self.basedir = tempfile.mkdtemp()
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225 self.old_path = sys.path[:]
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226
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227 def tearDown(self):
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228 sys.path[:] = self.old_path
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229 shutil.rmtree(self.basedir)
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230
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231 def create_module(self, name, contents):
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232 base, final = name.rsplit('.', 1)
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233 base_path = os.path.join(self.basedir, base.replace('.', os.path.sep))
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234 os.makedirs(base_path, exist_ok=True)
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235 with open(os.path.join(base_path, final + ".py"), 'w') as f:
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236 f.write(contents)
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237
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238 def test_nested(self):
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239 pkgutil_boilerplate = (
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240 'import pkgutil; '
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241 '__path__ = pkgutil.extend_path(__path__, __name__)')
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242 self.create_module('a.pkg.__init__', pkgutil_boilerplate)
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243 self.create_module('b.pkg.__init__', pkgutil_boilerplate)
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244 self.create_module('a.pkg.subpkg.__init__', pkgutil_boilerplate)
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245 self.create_module('b.pkg.subpkg.__init__', pkgutil_boilerplate)
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246 self.create_module('a.pkg.subpkg.c', 'c = 1')
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247 self.create_module('b.pkg.subpkg.d', 'd = 2')
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248 sys.path.insert(0, os.path.join(self.basedir, 'a'))
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249 sys.path.insert(0, os.path.join(self.basedir, 'b'))
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250 import pkg
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251 self.addCleanup(unload, 'pkg')
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252 self.assertEqual(len(pkg.__path__), 2)
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253 import pkg.subpkg
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254 self.addCleanup(unload, 'pkg.subpkg')
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255 self.assertEqual(len(pkg.subpkg.__path__), 2)
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256 from pkg.subpkg.c import c
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257 from pkg.subpkg.d import d
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258 self.assertEqual(c, 1)
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259 self.assertEqual(d, 2)
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260
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261
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262 class ImportlibMigrationTests(unittest.TestCase):
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263 # With full PEP 302 support in the standard import machinery, the
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264 # PEP 302 emulation in this module is in the process of being
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265 # deprecated in favour of importlib proper
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266
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267 def check_deprecated(self):
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268 return check_warnings(
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269 ("This emulation is deprecated, use 'importlib' instead",
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270 DeprecationWarning))
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271
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272 def test_importer_deprecated(self):
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273 with self.check_deprecated():
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274 x = pkgutil.ImpImporter("")
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275
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276 def test_loader_deprecated(self):
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277 with self.check_deprecated():
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278 x = pkgutil.ImpLoader("", "", "", "")
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279
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280 def test_get_loader_avoids_emulation(self):
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281 with check_warnings() as w:
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282 self.assertIsNotNone(pkgutil.get_loader("sys"))
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283 self.assertIsNotNone(pkgutil.get_loader("os"))
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284 self.assertIsNotNone(pkgutil.get_loader("test.support"))
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285 self.assertEqual(len(w.warnings), 0)
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286
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287 def test_get_importer_avoids_emulation(self):
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288 # We use an illegal path so *none* of the path hooks should fire
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289 with check_warnings() as w:
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290 self.assertIsNone(pkgutil.get_importer("*??"))
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291 self.assertEqual(len(w.warnings), 0)
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292
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293 def test_iter_importers_avoids_emulation(self):
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294 with check_warnings() as w:
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295 for importer in pkgutil.iter_importers(): pass
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296 self.assertEqual(len(w.warnings), 0)
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297
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298
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299 def test_main():
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300 run_unittest(PkgutilTests, PkgutilPEP302Tests, ExtendPathTests,
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301 NestedNamespacePackageTest, ImportlibMigrationTests)
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302 # this is necessary if test is run repeated (like when finding leaks)
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303 import zipimport
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304 import importlib
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305 zipimport._zip_directory_cache.clear()
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306 importlib.invalidate_caches()
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307
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308
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309 if __name__ == '__main__':
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310 test_main()