issues: 512879550

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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
512879550 MDU6SXNzdWU1MTI4Nzk1NTA= 3452 [feature request] __iter__() for rolling-window on datasets 1200058 open 0     2 2019-10-26T20:08:06Z 2021-02-18T21:41:58Z   NONE      

Currently, rolling() on a dataset does not return an iterator:

MCVE Code Sample

```python arr = xr.DataArray(np.arange(0, 7.5, 0.5).reshape(3, 5), dims=('x', 'y'))

r = arr.to_dataset(name="test").rolling(y=3) for label, arr_window in r: print(label)

TypeError Traceback (most recent call last) <ipython-input-12-b1703cb71c1e> in <module> 3 4 r = arr.to_dataset(name="test").rolling(y=3) ----> 5 for label, arr_window in r: 6 print(label)

TypeError: 'DatasetRolling' object is not iterable ```

Output of xr.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.7.4 (default, Aug 13 2019, 20:35:49) [GCC 7.3.0] python-bits: 64 OS: Linux OS-release: 5.3.7-arch1-1-ARCH machine: x86_64 processor: byteorder: little LC_ALL: None LANG: de_DE.UTF-8 LOCALE: de_DE.UTF-8 libhdf5: 1.10.4 libnetcdf: None xarray: 0.13.0 pandas: 0.24.2 numpy: 1.16.4 scipy: 1.3.0 netCDF4: None pydap: None h5netcdf: 0.7.4 h5py: 2.9.0 Nio: None zarr: None cftime: None nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: None dask: 2.1.0 distributed: 2.1.0 matplotlib: 3.1.1 cartopy: None seaborn: 0.9.0 numbagg: None setuptools: 41.4.0 pip: 19.1.1 conda: None pytest: None IPython: 7.8.0 sphinx: None 
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     13221727 issue

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