Deprecations of levels in categorical in 2017/ after 0.18

[jankatins]

levels was renamed to categories. Take out the deprecated property, the proerty in the Series.cat accessor, and the attribute in the constructor

Look for TODO: Remove after deprecation period in 2017/ after 0.18 and TODO: remove levels after the deprecation period.

Should be added to #6581

[jtratner]

@JanSchulz what's going to happen to functions like reorder_levels and remove_unused_levels? Are those going to be replaced as well? I was inspired by this to go change all the references to levels in Categorical docs to categories, and then noticed these other functions.

[jtratner]

additionally, reorder_levels has a different meaning for Series and DataFrame

[jreback]

this is already fixed (just not merged yet): #8153

[jreback]

@jtratner reorder_levels is not the method anyhow, its s.cat.reorder_levels() (now s.cat.reorder_categories()) doesn't act on the Series OR DataFrame, rather on an embedded Categorical

[jankatins]

The <whatever_levels> methods in Categorical and Series.cat.<whatever>_levels were never public API in a stable release, so don't need a deprecation cycle.

[jtratner]

I was just behind the times here :)

On Wed, Sep 24, 2014 at 1:53 PM, Jan Schulz notifications@github.com
wrote:

The <whatever_levels> methods in Categorical and
Series.cat._levels were never public API, so don't need a
deprecation cycle.

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