Do not import pathlib2 as pathlib if available

- pathlib2 is now considered to have the same functionality as pathlib
- fixes broken new pathlib functionality if pathlib2 is installed
- see pytest-dev#592

CHANGES.md

@@ -3,10 +3,16 @@ The released versions correspond to PyPi releases.
 
 ## Version 4.5.0 (as yet unreleased)
 
+### Changes
+  * `pathlib2` is still supported, but considered to have the same
+     functionality as `pathlib` and is no longer tested separately;
+     the previous behavior broke newer `pathlib` features if `pathlib2`
+     was installed (see [#592](../../issues/592))
+
 ## [Version 4.4.0](https://pypi.python.org/pypi/pyfakefs/4.4.0) (2021-02-24)
 Adds better support for Python 3.8 / 3.9.
 
-#### New Features
+### New Features
   * added support for `pathlib.Path.link_to` (new in Python 3.8) 
     (see [#580](../../issues/580))
   * added support for `pathlib.Path.readlink` (new in Python 3.9) 

pyfakefs/extra_packages.py

@@ -16,13 +16,8 @@
 
 try:
     import pathlib2
-
-    pathlib = pathlib2
 except ImportError:
     pathlib2 = None
-    import pathlib
-
-    pathlib = pathlib
 
 try:
     import scandir

pyfakefs/fake_filesystem_unittest.py

@@ -64,7 +64,7 @@
 from pyfakefs import fake_filesystem_shutil
 from pyfakefs import fake_pathlib
 from pyfakefs import mox3_stubout
-from pyfakefs.extra_packages import pathlib, pathlib2, use_scandir
+from pyfakefs.extra_packages import pathlib2, use_scandir
 
 if use_scandir:
     from pyfakefs import fake_scandir
@@ -504,6 +504,7 @@ def _init_fake_module_classes(self):
             'os': fake_filesystem.FakeOsModule,
             'shutil': fake_filesystem_shutil.FakeShutilModule,
             'io': fake_filesystem.FakeIoModule,
+            'pathlib': fake_pathlib.FakePathlibModule
         }
         if IS_PYPY:
             # in PyPy io.open, the module is referenced as _io
@@ -512,13 +513,9 @@ def _init_fake_module_classes(self):
         # class modules maps class names against a list of modules they can
         # be contained in - this allows for alternative modules like
         # `pathlib` and `pathlib2`
-        self._class_modules['Path'] = []
-        if pathlib:
-            self._fake_module_classes[
-                'pathlib'] = fake_pathlib.FakePathlibModule
-            self._class_modules['Path'].append('pathlib')
-            self._unfaked_module_classes[
-                'pathlib'] = fake_pathlib.RealPathlibModule
+        self._class_modules['Path'] = ['pathlib']
+        self._unfaked_module_classes[
+            'pathlib'] = fake_pathlib.RealPathlibModule
         if pathlib2:
             self._fake_module_classes[
                 'pathlib2'] = fake_pathlib.FakePathlibModule

pyfakefs/fake_pathlib.py

@@ -32,12 +32,13 @@
 import fnmatch
 import functools
 import os
+import pathlib
 import re
 import sys
 from urllib.parse import quote_from_bytes as urlquote_from_bytes
 
 from pyfakefs import fake_scandir
-from pyfakefs.extra_packages import use_scandir, pathlib, pathlib2
+from pyfakefs.extra_packages import use_scandir
 from pyfakefs.fake_filesystem import FakeFileOpen, FakeFilesystem
 
 
@@ -493,7 +494,7 @@ def resolve(self, strict=None):
         Raises:
             OSError: if the path doesn't exist (strict=True or Python < 3.6)
         """
-        if sys.version_info >= (3, 6) or pathlib2:
+        if sys.version_info >= (3, 6):
             if strict is None:
                 strict = False
         else:

pyfakefs/pytest_tests/example.py

@@ -12,14 +12,6 @@
 
 # Used as SUT for pytest_fixture_test.py
 
-try:
-    from pathlib2 import Path
+from pathlib import Path
 
-    EXAMPLE_FILE = Path('/test') / 'file'
-except ImportError:
-    try:
-        from pathlib import Path
-
-        EXAMPLE_FILE = Path('/test') / 'file'
-    except ImportError:
-        EXAMPLE_FILE = None
+EXAMPLE_FILE = Path('/test') / 'file'

pyfakefs/tests/all_tests_without_extra_packages.py

@@ -11,21 +11,13 @@
 # limitations under the License.
 
 """A test suite that runs all tests for pyfakefs at once.
-Excludes tests using external pathlib2 and scandir packages."""
+Excludes tests using external scandir package."""
 
 import sys
 import unittest
 
 from pyfakefs import extra_packages
 
-if extra_packages.pathlib2:
-    extra_packages.pathlib2 = None
-    try:
-        import pathlib
-    except ImportError:
-        pathlib = None
-    extra_packages.pathlib = pathlib
-
 if extra_packages.use_scandir_package:
     extra_packages.use_scandir_package = False
     try:

pyfakefs/tests/dynamic_patch_test.py

@@ -13,10 +13,10 @@
 """
 Tests for patching modules loaded after `setUpPyfakefs()`.
 """
+import pathlib
 import unittest
 
 from pyfakefs import fake_filesystem_unittest
-from pyfakefs.extra_packages import pathlib
 
 
 class TestPyfakefsUnittestBase(fake_filesystem_unittest.TestCase):

pyfakefs/tests/fake_filesystem_unittest_test.py

@@ -21,6 +21,7 @@
 import io
 import multiprocessing
 import os
+import pathlib
 import runpy
 import shutil
 import sys
@@ -34,7 +35,6 @@
 import pyfakefs.tests.import_as_example
 import pyfakefs.tests.logsio
 from pyfakefs import fake_filesystem_unittest, fake_filesystem
-from pyfakefs.extra_packages import pathlib
 from pyfakefs.fake_filesystem import OSType
 from pyfakefs.fake_filesystem_unittest import (
     Patcher, Pause, patchfs, PatchMode

pyfakefs/tests/fake_pathlib_test.py

@@ -22,11 +22,11 @@
 
 import errno
 import os
+import pathlib
 import stat
 import sys
 import unittest
 
-from pyfakefs.extra_packages import pathlib, pathlib2
 from pyfakefs.fake_filesystem import is_root
 
 from pyfakefs import fake_pathlib, fake_filesystem
@@ -35,20 +35,10 @@
 is_windows = sys.platform == 'win32'
 
 
-def skip_if_pathlib_36_not_available():
-    if sys.version_info < (3, 6) and not pathlib2:
-        raise unittest.SkipTest('Changed behavior in Python 3.6')
-
-
-def skip_if_pathlib_36_is_available():
-    if sys.version_info >= (3, 6) or pathlib2:
-        raise unittest.SkipTest('Changed behavior in Python 3.6')
-
-
 class RealPathlibTestCase(RealFsTestCase):
     def __init__(self, methodName='runTest'):
         super(RealPathlibTestCase, self).__init__(methodName)
-        self.pathlib = pathlib or pathlib2
+        self.pathlib = pathlib
         self.path = None
 
     def setUp(self):
@@ -238,8 +228,8 @@ def test_relative_to(self):
         with self.assertRaises(ValueError):
             self.path('passwd').relative_to('/usr')
 
-    @unittest.skipIf(sys.version_info < (3, 9) or pathlib2,
-                     'readlink new in Python 3.9')
+    @unittest.skipIf(sys.version_info < (3, 9),
+                     'is_relative_to new in Python 3.9')
     def test_is_relative_to(self):
         path = self.path('/etc/passwd')
         self.assertTrue(path.is_relative_to('/etc'))
@@ -418,11 +408,6 @@ def test_resolve(self):
                 self.os.path.realpath(
                     self.make_path('antoine', 'setup.py'))))
 
-    def test_resolve_nonexisting_file(self):
-        skip_if_pathlib_36_is_available()
-        path = self.path('/foo/bar')
-        self.assert_raises_os_error(errno.ENOENT, path.resolve)
-
     def test_stat_file_in_unreadable_dir(self):
         self.check_posix_only()
         dir_path = self.make_path('some_dir')
@@ -448,25 +433,7 @@ def test_iterdir_in_unreadable_dir(self):
             path = str(list(iter)[0])
             self.assertTrue(path.endswith('some_file'))
 
-    @unittest.skipIf(not is_windows, 'Windows specific behavior')
-    def test_resolve_file_as_parent_windows(self):
-        skip_if_pathlib_36_is_available()
-        self.check_windows_only()
-        self.create_file(self.make_path('a_file'))
-        path = self.path(self.make_path('a_file', 'this can not exist'))
-        self.assert_raises_os_error(errno.ENOENT, path.resolve)
-
-    @unittest.skipIf(is_windows, 'POSIX specific behavior')
-    def test_resolve_file_as_parent_posix(self):
-        skip_if_pathlib_36_is_available()
-        self.check_posix_only()
-        self.create_file(self.make_path('a_file'))
-        path = self.path(
-            self.make_path('', 'a_file', 'this can not exist'))
-        self.assert_raises_os_error(errno.ENOTDIR, path.resolve)
-
-    def test_resolve_nonexisting_file_after_36(self):
-        skip_if_pathlib_36_not_available()
+    def test_resolve_nonexisting_file(self):
         path = self.path(
             self.make_path('/path', 'to', 'file', 'this can not exist'))
         self.assertEqual(path, path.resolve())
@@ -644,7 +611,7 @@ def test_symlink_to(self):
         self.assertTrue(self.os.path.exists(link_name))
         self.assertTrue(path.is_symlink())
 
-    @unittest.skipIf(sys.version_info < (3, 8) or pathlib2,
+    @unittest.skipIf(sys.version_info < (3, 8),
                      'link_to new in Python 3.8')
     def test_link_to(self):
         self.skip_if_symlink_not_supported()
@@ -658,20 +625,7 @@ def test_link_to(self):
         self.assertFalse(path.is_symlink())
         self.assertEqual(2, self.os.stat(file_name).st_nlink)
 
-    @unittest.skipIf(sys.version_info < (3, 8) or not pathlib2,
-                     'pathlib2 has no link_to')
-    def test_pathlib2_does_not_have_link_to(self):
-        self.skip_if_symlink_not_supported()
-        file_name = self.make_path('foo', 'bar.txt')
-        self.create_file(file_name)
-        self.assertEqual(1, self.os.stat(file_name).st_nlink)
-        link_name = self.make_path('link_to_bar')
-        path = self.path(file_name)
-        with self.assertRaises(AttributeError):
-            path.link_to(link_name)
-        self.assertFalse(self.os.path.exists(link_name))
-
-    @unittest.skipIf(sys.version_info < (3, 9) or pathlib2,
+    @unittest.skipIf(sys.version_info < (3, 9),
                      'readlink new in Python 3.9')
     def test_readlink(self):
         self.skip_if_symlink_not_supported()