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Empty Categorical has float dtype for .categories #17248

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TomAugspurger opened this issue Aug 14, 2017 · 0 comments
Closed

Empty Categorical has float dtype for .categories #17248

TomAugspurger opened this issue Aug 14, 2017 · 0 comments
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Categorical Categorical Data Type Dtype Conversions Unexpected or buggy dtype conversions
Milestone
0.21.0

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@TomAugspurger
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TomAugspurger commented Aug 14, 2017 •
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It'd be more consistent if this had object dtype (and so an Index([]) instead of a Float64Index([]).

In [4]: pd.Categorical([]).categories.dtype
Out[4]: dtype('float64')

I suspect this is just an implementation detail, not intentional.
Came up in #17236 (my rework to remove the keyword).
@TomAugspurger TomAugspurger added Categorical Categorical Data Type Dtype Conversions Unexpected or buggy dtype conversions labels Aug 14, 2017
@TomAugspurger TomAugspurger mentioned this issue Aug 14, 2017
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@jreback jreback added this to the 0.21.0 milestone Aug 15, 2017
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Categorical Categorical Data Type Dtype Conversions Unexpected or buggy dtype conversions
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