DOC/BUG: errors in the categorical docs

[jorisvandenbossche]

After #7917 still some errors in the categorical docs:

• Docs say "Writing data to a HDF store works", but df.to_hdf(hdf_file, "frame") gives a TypeError: objects of type ``Categorical`` are not supported in this context, sorry (http://pandas-docs.github.io/pandas-docs-travis/categorical.html#getting-data-in-out). Also pd.read_hdf(hdf_file, "frame") gives an error.
• In the section about indexing, df.ix["h":"j",0:1] gives a AttributeError: 'DataFrame' object has no attribute '_is_view' (http://pandas-docs.github.io/pandas-docs-travis/categorical.html#getting)

[jreback]

hmm

2nd is a non tested case (and buggy)

1st is correct - I made this raise TypeError for now

maybe just say this is not supported at the moment

[jreback]

I take that back

this needs format='table' and it will coerce

will fix

[jorisvandenbossche]

Is my second bullet point also fixed with that PR?

[jorisvandenbossche]

ah, yes, nevermind, I see it is in the tests

[jreback]

yep that was a subtl bug