[Dune-devel] Python tests fail but changes are unrelated

[Christoph Grüninger]

Hi Dune developers,
I added a commit to dune-grid!571, that adds mostly comments and one 
deprecation warning. But after the commit Python tests are falling, see 
one example attached. What did I do? What should I do?

Thanks
Christoph

DUNE-INFO: Compiling HierarchicalGrid (new)
Traceback (most recent call last):
   File "test_gf1.py", line 56, in <module>
     gridView = structuredGrid([0,0],[1,1],[10,10])
   File "/builds/core/dune-grid/build-cmake/python/dune/grid/core.py", 
line 52, in structuredGrid
     return yaspGrid(domain, dimgrid=len(lower))
   File "/builds/core/dune-grid/build-cmake/python/dune/grid/_grids.py", 
line 38, in yaspGrid
     gridModule = module(includes, typeName, ctor)
   File 
"/builds/core/dune-grid/build-cmake/python/dune/grid/grid_generator.py", 
line 348, in module
     module = generator.load(includes, typeName, typeHash, *args, **kwargs)
   File 
"/duneci/modules/dune-common/build-cmake/python/dune/generator/generator.py", 
line 169, in load
     return self.post(moduleName, source, postscript, extraCMake)
   File 
"/duneci/modules/dune-common/build-cmake/python/dune/generator/generator.py", 
line 121, in post
     module = builder.load(moduleName, source, self.typeName[0], extraCMake)
   File 
"/duneci/modules/dune-common/build-cmake/python/dune/generator/cmakebuilder.py", 
line 341, in load
     self.compile(infoTxt=PrintCompiling, target=moduleName)
   File 
"/duneci/modules/dune-common/build-cmake/python/dune/generator/cmakebuilder.py", 
line 237, in compile
     logLevel=logging.INFO
   File 
"/duneci/modules/dune-common/build-cmake/python/dune/generator/cmakebuilder.py", 
line 215, in callCMake
     _, stderr = cmake.communicate()
   File "/usr/lib/python3.7/subprocess.py", line 939, in communicate
     stdout, stderr = self._communicate(input, endtime, timeout)
   File "/usr/lib/python3.7/subprocess.py", line 1672, in _communicate
     selector.register(self.stdout, selectors.EVENT_READ)
   File "/usr/lib/python3.7/selectors.py", line 352, in register
     key = super().register(fileobj, events, data)
   File "/usr/lib/python3.7/selectors.py", line 238, in register
     key = SelectorKey(fileobj, self._fileobj_lookup(fileobj), events, data)
   File "/usr/lib/python3.7/selectors.py", line 225, in _fileobj_lookup
     return _fileobj_to_fd(fileobj)
   File "/usr/lib/python3.7/selectors.py", line 40, in _fileobj_to_fd
     "{!r}".format(fileobj)) from None
ValueError: Invalid file object: <_io.BufferedReader name=20>