I maintain an open source library, xarray, which runs integration tests on Travis-CI using pytest. We install the scientific Python using stack conda.
Earlier today, our two out of our five test builds (Python 3.5 and 3.6, but not Python 2.7 or 3.4) started failing for no apparent reason. pytest itself fails, with an mystifying trackback:
$ py.test xarray --cov=xarray --cov-config ci/.coveragerc --cov-report term-missing --verbose $EXTRA_FLAGS
Traceback (most recent call last):
File "/home/travis/miniconda/envs/test_env/bin/py.test", line 6, in <module>
sys.exit(py.test.main())
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/config.py", line 49, in main
config = _prepareconfig(args, plugins)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/config.py", line 168, in _prepareconfig
pluginmanager=pluginmanager, args=args)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 745, in __call__
return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 339, in _hookexec
return self._inner_hookexec(hook, methods, kwargs)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 334, in <lambda>
_MultiCall(methods, kwargs, hook.spec_opts).execute()
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 613, in execute
return _wrapped_call(hook_impl.function(*args), self.execute)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 250, in _wrapped_call
wrap_controller.send(call_outcome)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/helpconfig.py", line 68, in pytest_cmdline_parse
config = outcome.get_result()
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 279, in get_result
raise ex[1].with_traceback(ex[2])
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 265, in __init__
self.result = func()
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 614, in execute
res = hook_impl.function(*args)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/config.py", line 957, in pytest_cmdline_parse
self.parse(args)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/config.py", line 1121, in parse
self._preparse(args, addopts=addopts)
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/config.py", line 1084, in _preparse
self.pluginmanager.load_setuptools_entrypoints('pytest11')
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 510, in load_setuptools_entrypoints
plugin = ep.load()
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2409, in load
return self.resolve()
File "/home/travis/miniconda/envs/test_env/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2415, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
ModuleNotFoundError: No module named 'hypothesis.extra.pytestplugin'
A few things are surprising things to me about this:
- We don't use hypothesis or install
hypothesis.extra.pytestplugin. I have no idea where this came from. - There's nothing obvious that changed to trigger this error. It first appeared after a one line doc change. The installed Python libraries, including the specific binary builds installed by conda, appear to be exactly the same. (You can
diffthe build outputs yourself if you like, though.)
If you have any clues or guesses about what's going on that, your help would be appreciated! I don't even know where in the stack to file a bug.
