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I'm not opposed to this in principle, but I think the API will necessarily be clunky. Would we require (or allow) the user to specify all categories in the call to read_csv.
@esafak we do support categoricals in read/write_hdf if that's an option for you (it may not be).
Can't we already declare the dtypes of selected columns? I thought the problem was limited to categoricals, but if not, please expand my request to all dtypes.
It would be nice to be able to read CSVs with categorical variables using read_csv's dtype parameter instead of casting the columns after the fact.
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