id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type 128749355,MDExOlB1bGxSZXF1ZXN0NTcxNzg1MzU=,726,Make import error of tokenize more explicit,7799184,closed,0,,,2,2016-01-26T07:46:21Z,2016-01-27T16:27:05Z,2016-01-27T16:26:55Z,CONTRIBUTOR,,0,pydata/xarray/pulls/726,"This [ImportError](https://github.com/pydata/xarray/blob/master/xarray/backends/api.py#L161-L165) is raised when using open_mfdataset, even though my version of dask is > 0.6: ``` --------------------------------------------------------------------------- ImportError Traceback (most recent call last) in () ----> 1 dset = xarray.open_mfdataset('/Users/rafaguedes/work/campos20150709_0*.nc') /source/xarray/xarray/backends/api.pyc in open_mfdataset(paths, chunks, concat_dim, preprocess, engine, lock, **kwargs) 297 lock = _default_lock(paths[0], engine) 298 datasets = [open_dataset(p, engine=engine, chunks=chunks or {}, lock=lock, --> 299 **kwargs) for p in paths] 300 file_objs = [ds._file_obj for ds in datasets] 301 /source/xarray/xarray/backends/api.pyc in open_dataset(filename_or_obj, group, decode_cf, mask_and_scale, decode_times, concat_characters, decode_coords, engine, chunks, lock, drop_variables) 222 lock = _default_lock(filename_or_obj, engine) 223 with close_on_error(store): --> 224 return maybe_decode_store(store, lock) 225 else: 226 if engine is not None and engine != 'scipy': /source/xarray/xarray/backends/api.pyc in maybe_decode_store(store, lock) 163 except ImportError: 164 import dask # raise the usual error if dask is entirely missing --> 165 raise ImportError('xarray requires dask version 0.6 or newer') 166 167 if (isinstance(filename_or_obj, basestring) and ImportError: xarray requires dask version 0.6 or newer ``` ``` In [3]: import dask In [4]: dask.__version__ Out[4]: '0.7.6' ``` This change ensures the actual error caused by the missing library is displayed: ``` --------------------------------------------------------------------------- ImportError Traceback (most recent call last) in () ----> 1 dset = xarray.open_mfdataset('/Users/rafaguedes/work/campos20150709_0*.nc') /source/xarray/xarray/backends/api.py in open_mfdataset(paths, chunks, concat_dim, preprocess, engine, lock, **kwargs) 300 lock = _default_lock(paths[0], engine) 301 datasets = [open_dataset(p, engine=engine, chunks=chunks or {}, lock=lock, --> 302 **kwargs) for p in paths] 303 file_objs = [ds._file_obj for ds in datasets] 304 /source/xarray/xarray/backends/api.py in open_dataset(filename_or_obj, group, decode_cf, mask_and_scale, decode_times, concat_characters, decode_coords, engine, chunks, lock, drop_variables) 225 lock = _default_lock(filename_or_obj, engine) 226 with close_on_error(store): --> 227 return maybe_decode_store(store, lock) 228 else: 229 if engine is not None and engine != 'scipy': /source/xarray/xarray/backends/api.py in maybe_decode_store(store, lock) 166 raise ImportError('xarray requires dask version 0.6 or newer') 167 else: --> 168 raise ImportError(err) 169 170 if (isinstance(filename_or_obj, basestring) and ImportError: No module named toolz ``` ","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/726/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull