issue_comments: 629390609

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https://github.com/pydata/xarray/pull/4064#issuecomment-629390609 https://api.github.com/repos/pydata/xarray/issues/4064 629390609 MDEyOklzc3VlQ29tbWVudDYyOTM5MDYwOQ== 56925856 2020-05-15T17:40:39Z 2020-05-15T17:41:25Z CONTRIBUTOR

@dcherian do you have any idea about this mypy Type error? I can't find much (accessible) documentation on how the Union[] is working in this context.

xarray/core/dataset.py:1737: error: Argument 2 to "fromkeys" of "dict" has incompatible type "Union[Number, Mapping[Hashable, Union[None, Number, Tuple[Number, ...]]]]"; expected "Union[None, Number, Tuple[Number, ...]]" xarray/core/dataset.py:1740: error: Item "Number" of "Union[Number, Mapping[Hashable, Union[None, Number, Tuple[Number, ...]]]]" has no attribute "keys"

Edit: thanks to everyone for your help so far! 

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