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  • implement normalize_token · 2 ✖

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541315926 https://github.com/pydata/xarray/issues/3378#issuecomment-541315926 https://api.github.com/repos/pydata/xarray/issues/3378 MDEyOklzc3VlQ29tbWVudDU0MTMxNTkyNg== crusaderky 6213168 2019-10-12T11:27:52Z 2019-10-12T11:38:11Z MEMBER

https://docs.dask.org/en/latest/custom-collections.html#implementing-deterministic-hashing

```python @normalize_token.register(Dataset) def tokenize_dataset(ds): return Dataset, ds._variables, ds._coord_names, ds._attrs

@normalize_token.register(DataArray) def tokenize_dataarray(da): return DataArray, ds._variable, ds._coords, ds._name

Note: the @singledispatch for IndexVariable must be defined before the one for Variable

@normalize_token.register(IndexVariable) def tokenize_indexvariable(v): # Don't waste time converting pd.Index to np.ndarray return IndexVariable, v._dims, v._data.array, v._attrs

@normalize_token.register(Variable) def tokenize_variable(v): # Note: it's v.data, not v._data, in order to cope with the # wrappers around NetCDF and the like return Variable, v._dims, v.data, v._attrs ```

You'll need to write a dummy normalize_token for when dask is not installed.

Unit tests: - running tokenize() twice on the same object returns the same result - changing the content of a data_var (or the variable, for DataArray) changes the output - changing the content of a coord changes the output - changing attrs, name, or dimension names change the output - whether a variable is a data_var or a coord changes the output - dask arrays aren't computed - non-numpy, non-dask NEP18 data is not converted to numpy - works with xarray's fancy wrappers around NetCDF and the like

 
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   implement normalize_token 503578688
541121326 https://github.com/pydata/xarray/issues/3378#issuecomment-541121326 https://api.github.com/repos/pydata/xarray/issues/3378 MDEyOklzc3VlQ29tbWVudDU0MTEyMTMyNg== dcherian 2448579 2019-10-11T15:55:23Z 2019-10-11T15:55:23Z MEMBER

How should this be implemented?

 
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   implement normalize_token 503578688

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