issue_comments: 255497739

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https://github.com/pydata/xarray/issues/921#issuecomment-255497739 https://api.github.com/repos/pydata/xarray/issues/921 255497739 MDEyOklzc3VlQ29tbWVudDI1NTQ5NzczOQ== 1217238 2016-10-22T01:08:52Z 2016-10-22T01:08:52Z MEMBER

With optional indexes (#1017) meaning that ds.coords[...].size may not always succeed (OK, depending on some implementation choices), the need for a consistent way to look up dimension sizes becomes even more severe.

Rather than resolving the type inconsistency of dims, we could simply add a new attribute sizes to both Dataset and DataArray that is exactly equivalent to Dataset.dims. The Dataset API ends up a little bit redundant, but we have a consistent way to access this information.

 
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