py.test fails under Windows if using py >= 1.5.0

[mrbean-bremen]

Appveyor tests currently fail with while testing test ptest plugin with:

%PYTHON%\Scripts\py.test.exe pytest_plugin_test.py
============================= test session starts
platform win32 -- Python 2.7.14, pytest-3.2.5, py-1.5.1, pluggy-0.4.0
rootdir: C:\projects\pyfakefs, inifile:
plugins: pyfakefs-3.4
collected 1 item
pytest_plugin_test.py E
=================================== ERRORS ====================================
______________________ ERROR at setup of test_fs_fixture ______________________
request = <SubRequest 'fs' for <Function 'test_fs_fixture'>>
@pytest.fixture
def fs(request):
""" Fake filesystem. """

  patcher = Patcher()

c:\python27-x64\lib\site-packages\pyfakefs\pytest_plugin.py:22:

---

c:\python27-x64\lib\site-packages\pyfakefs\fake_filesystem_unittest.py:286: in init
self._findModules()

---

self = <pyfakefs.fake_filesystem_unittest.Patcher object at 0x000000000361B208>
def _findModules(self):
"""Find and cache all modules that import file system modules.
Later, setUp() will stub these with the fake file system
modules.
"""
for name, module in set(sys.modules.items()):
if (module in self.SKIPMODULES or
(not inspect.ismodule(module)) or
name.split('.')[0] in self._skipNames):
continue
# IMPORTANT TESTING NOTE: Whenever you add a new module below, test
# it by adding an attribute in fixtures/module_with_attributes.py
# and a test in fake_filesystem_unittest_test.py, class
# TestAttributesWithFakeModuleNames.

      if inspect.ismodule(module.__dict__.get('os')):

E ImportError: No module named syslog
c:\python27-x64\lib\site-packages\pyfakefs\fake_filesystem_unittest.py:328: ImportError

This does not happen with the same pytest version, but a py version < 1.5.0.
This may be a bug in py, or in our usage code.

[mrbean-bremen]

I installed a working py version in the appveyor tests to make the tests green, but we have to understand the problem.

[mrbean-bremen]

Ok, there is an error filed in py.
I will wait a while what happens with that (the bug has been filed recently).
Update: there is already a PR created that fixes this, including the update to 1.5.2.
I will wait until the pypi release and check if Appveyor will install the correct version implicitely afterwards.

[mrbean-bremen]

py has been fixed and released in version 1.5.2. Appveyor uses the new version for Python 2.7 and 3.6 builds, which succeed, but not for 3.3 build - that still fails.