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issues: 285349783

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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
285349783 MDU6SXNzdWUyODUzNDk3ODM= 1807 Empty DataArray should have a length of 0 13813076 closed 0     4 2018-01-02T03:24:08Z 2019-01-22T22:49:27Z 2019-01-22T22:49:27Z NONE      

python dr = xr.DataArray(()) len(dr)

When evaluating the length of an empty DataArray, instead of evaluating as zero, it raises a TypeError. Most other container classes (lists, dicts, ndarrays) all evaluate with a zero length when empty. I would expect and prefer that this class evaluate its length as zero when empty.

xr.show_versions() INSTALLED VERSIONS ------------------ commit: None python: 3.6.1.final.0 python-bits: 64 OS: Windows OS-release: 10 machine: AMD64 processor: Intel64 Family 6 Model 78 Stepping 3, GenuineIntel byteorder: little LC_ALL: None LANG: None LOCALE: None.None xarray: 0.10.0 pandas: 0.21.1 numpy: 1.13.3 scipy: 1.0.0 netCDF4: None h5netcdf: None Nio: None bottleneck: None cyordereddict: None dask: None matplotlib: None cartopy: None seaborn: None setuptools: 38.2.5 pip: 9.0.1 conda: None pytest: None IPython: 6.2.1 sphinx: None
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