Sympy: py.test without any arguments does not work

[asmeurer]

$py.test
==================================================================== test session starts =====================================================================
platform darwin -- Python 2.7.3 -- pytest-2.3.4
collected 0 items / 1 errors

=========================================================================== ERRORS ===========================================================================
_____________________________________________________________________ ERROR collecting . _____________________________________________________________________
/sw/lib/python2.7/site-packages/py/_path/common.py:315: in visit
>       for x in Visitor(fil, rec, ignore, bf, sort).gen(self):
/sw/lib/python2.7/site-packages/py/_path/common.py:361: in gen
>               for p in self.gen(subdir):
/sw/lib/python2.7/site-packages/py/_path/common.py:351: in gen
>                   if p.check(dir=1) and (rec is None or rec(p))])
/sw/lib/python2.7/site-packages/_pytest/main.py:546: in _recurse
>       ihook.pytest_collect_directory(path=path, parent=self)
/sw/lib/python2.7/site-packages/_pytest/main.py:156: in call_matching_hooks
>       plugins = self.config._getmatchingplugins(self.fspath)
/sw/lib/python2.7/site-packages/_pytest/config.py:319: in _getmatchingplugins
>       plugins += self._conftest.getconftestmodules(fspath)
/sw/lib/python2.7/site-packages/_pytest/config.py:214: in getconftestmodules
>                       clist.append(self.importconftest(conftestpath))
/sw/lib/python2.7/site-packages/_pytest/config.py:243: in importconftest
>           self._conftestpath2mod[conftestpath] = mod = conftestpath.pyimport()
/sw/lib/python2.7/site-packages/py/_path/local.py:551: in pyimport
>               raise self.ImportMismatchError(modname, modfile, self)
E               ImportMismatchError: ('sympy.conftest', '/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/conftest.py', local('/Users/aaronmeurer/Documents/Python/sympy/sympy/py3k-sympy/sympy/conftest.py'))
                                                                       DO *NOT* COMMIT!
================================================================== 1 error in 1.49 seconds ===================================================================

It seems to be confused about which conftest to use between the one in sympy/ and the one in py3k-sympy/.

Original issue for #6817: http://code.google.com/p/sympy/issues/detail?id=3718
Original author: https://code.google.com/u/[email protected]/

[skirpichev]

It does work for py.test version >= 2.5.2:

$ py.test
============================================================================= test session starts ==============================================================================
platform linux2 -- Python 2.7.3 -- py-1.4.20 -- pytest-2.5.2
plugins: cov
collected 6418 items / 1 skipped 

sympy/assumptions/tests/test_assumptions_2.py .....
sympy/assumptions/tests/test_context.py ....
sympy/assumptions/tests/test_matrices.py ...x........x..^C

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! KeyboardInterrupt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
/usr/lib/python2.7/threading.py:154: KeyboardInterrupt

But it doesn't for pytest-2.2.4 with different error (c.f. the issue description):

$ py.test
============================================================================= test session starts ==============================================================================
platform linux2 -- Python 2.7.3 -- pytest-2.2.4
collected 0 items / 1 errors 

==================================================================================== ERRORS ====================================================================================
______________________________________________________________________________ ERROR collecting . ______________________________________________________________________________
/usr/lib/python2.7/dist-packages/py/_path/common.py:315: in visit
>       for x in Visitor(fil, rec, ignore, bf, sort).gen(self):
/usr/lib/python2.7/dist-packages/py/_path/common.py:351: in gen
>                   if p.check(dir=1) and (rec is None or rec(p))])
/usr/lib/python2.7/dist-packages/_pytest/main.py:484: in _recurse
>       ihook.pytest_collect_directory(path=path, parent=self)
/usr/lib/python2.7/dist-packages/_pytest/main.py:140: in call_matching_hooks
>       plugins = self.config._getmatchingplugins(self.fspath)
/usr/lib/python2.7/dist-packages/_pytest/config.py:289: in _getmatchingplugins
>       plugins += self._conftest.getconftestmodules(fspath)
/usr/lib/python2.7/dist-packages/_pytest/config.py:188: in getconftestmodules
>                       clist.append(self.importconftest(conftestpath))
/usr/lib/python2.7/dist-packages/_pytest/config.py:217: in importconftest
>           self._conftestpath2mod[conftestpath] = mod = conftestpath.pyimport()
/usr/lib/python2.7/dist-packages/py/_path/local.py:532: in pyimport
>           __import__(modname)
sympy/conftest.py:64: in <module>
>   @pytest.fixture(autouse=True, scope='module')
E   AttributeError: 'module' object has no attribute 'fixture'
=========================================================================== 1 error in 0.86 seconds ===========================

@asmeurer, should we close this issue and fix py.test requirements?

[asmeurer]

I get

$py.test
==================================================================== test session starts =====================================================================
platform darwin -- Python 3.4.1 -- py-1.4.25 -- pytest-2.6.3
collected 0 items / 1 errors

=========================================================================== ERRORS ===========================================================================
_____________________________________________________________________ ERROR collecting . _____________________________________________________________________
../../../../anaconda3/lib/python3.4/site-packages/py/_path/common.py:331: in visit
    for x in Visitor(fil, rec, ignore, bf, sort).gen(self):
../../../../anaconda3/lib/python3.4/site-packages/py/_path/common.py:377: in gen
    for p in self.gen(subdir):
../../../../anaconda3/lib/python3.4/site-packages/py/_path/common.py:377: in gen
    for p in self.gen(subdir):
../../../../anaconda3/lib/python3.4/site-packages/py/_path/common.py:366: in gen
    dirs = self.optsort([p for p in entries
../../../../anaconda3/lib/python3.4/site-packages/py/_path/common.py:367: in <listcomp>
    if p.check(dir=1) and (rec is None or rec(p))])
../../../../anaconda3/lib/python3.4/site-packages/_pytest/main.py:628: in _recurse
    ihook.pytest_collect_directory(path=path, parent=self)
../../../../anaconda3/lib/python3.4/site-packages/_pytest/main.py:166: in call_matching_hooks
    plugins = self.config._getmatchingplugins(self.fspath)
../../../../anaconda3/lib/python3.4/site-packages/_pytest/config.py:688: in _getmatchingplugins
    plugins += self._conftest.getconftestmodules(fspath)
../../../../anaconda3/lib/python3.4/site-packages/_pytest/config.py:521: in getconftestmodules
    mod = self.importconftest(conftestpath)
../../../../anaconda3/lib/python3.4/site-packages/_pytest/config.py:545: in importconftest
    raise ConftestImportFailure(conftestpath, sys.exc_info())
E   _pytest.config.ConftestImportFailure: (local('/Users/aaronmeurer/Documents/Python/sympy/sympy-scratch/build/lib/sympy/conftest.py'), (<class 'py._path.local.LocalPath.ImportMismatchError'>, ImportMismatchError('sympy.conftest', '/Users/aaronmeurer/Documents/Python/sympy/sympy-scratch/sympy/conftest.py', local('/Users/aaronmeurer/Documents/Python/sympy/sympy-scratch/build/lib/sympy/conftest.py')), <traceback object at 0x106a35088>))
                                                                       DO *NOT* COMMIT!
================================================================== 1 error in 0.71 seconds ===================================================================

[stleon]

I delete .cache dir, run

pip uninstall pytest
pip install pytest

And it works without ImportMismatchError