[yt-dev] Issue #1039: Can't compile cython code with latest dev (yt_analysis/yt)

[Adam Ginsburg]

New issue 1039: Can't compile cython code with latest dev
https://bitbucket.org/yt_analysis/yt/issue/1039/cant-compile-cython-code-with-latest-dev

Adam Ginsburg:

(this could be an hg mistake on my part though)

I get this traceback when doing `python setup.py install` on the commit yt::16305:4d383ff42e24 (I think that's branch::commit#:commithash) 


```
Error compiling Cython file:
------------------------------------------------------------
...
    # So, let's compute these vectors.  See above where these are written out
    # for ease of use.
    cdef np.float64_t vec1[3], vec2[3], cp_vec[3], dp, npoint[3]
    cdef np.uint8_t faces[MAX_NUM_FACES][2][2], nf
    if nvertices == 4:
        faces = tetra_face_defs
             ^
------------------------------------------------------------

yt/utilities/lib/pixelization_routines.pyx:382:14: Assignment to non-lvalue 'faces'

Error compiling Cython file:
------------------------------------------------------------
...
    cdef np.uint8_t faces[MAX_NUM_FACES][2][2], nf
    if nvertices == 4:
        faces = tetra_face_defs
        nf = TETRA_NF
    elif nvertices == 6:
        faces = wedge_face_defs
             ^
------------------------------------------------------------

yt/utilities/lib/pixelization_routines.pyx:385:14: Assignment to non-lvalue 'faces'

Error compiling Cython file:
------------------------------------------------------------
...
        nf = TETRA_NF
    elif nvertices == 6:
        faces = wedge_face_defs
        nf = WEDGE_NF
    elif nvertices == 8:
        faces = hex_face_defs
             ^
------------------------------------------------------------

yt/utilities/lib/pixelization_routines.pyx:388:14: Assignment to non-lvalue 'faces'
error: 3 errors while compiling 'yt/utilities/lib/pixelization_routines.pyx' with Cython
```

Is this just me doing something stupid in a dirty build environment, or is there a real underlying issue?

Note that I attempted to update in the hope of correcting this error that I had encountered a few months ago when running `export_sketchfab`:
```
  File "/Users/adam/repos/yt/yt/data_objects/construction_data_containers.py", line 1722, in export_sketchfab
    sample_type = "vertex")
  File "/Users/adam/repos/yt/yt/data_objects/construction_data_containers.py", line 1571, in export_ply
    self.get_data(color_field, sample_type)
  File "/Users/adam/repos/yt/yt/data_objects/construction_data_containers.py", line 1009, in get_data
    preload_fields = deps)):
  File "/Users/adam/repos/yt/yt/utilities/parallel_tools/parallel_analysis_interface.py", line 507, in parallel_objects
    for obj_id, obj in oiter:
  File "/Users/adam/repos/yt/yt/data_objects/data_containers.py", line 599, in chunks
    for chunk in self.index._chunk(self, chunking_style, **kwargs):
  File "/Users/adam/repos/yt/yt/geometry/geometry_handler.py", line 266, in _chunk
    return self._chunk_io(dobj, **kwargs)
TypeError: _chunk_io() got an unexpected keyword argument 'preload_fields'
```