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Showing content from https://github.com/pandas-dev/pandas/issues/9927 below:

awkward syntax to add categories to a Categorical · Issue #9927 · pandas-dev/pandas · GitHub

from SO

• the .add_categories should be able to take an Index/ndarray, ATM it must be converted to a list
• should be a keyword for something like: add any additional categories that I am passing to you (even if the current ones are duplicates, just add these to the end). e.g.

In [147]: s = pd.Categorical(list('aabbcd'))

In [148]: s2 = list('aabbcdefg')

In [149]: s
Out[149]: 
[a, a, b, b, c, d]
Categories (4, object): [a, b, c, d]

In [150]: s.add_categories(s.categories.sym_diff(Index(s2)).tolist())
Out[150]: 
[a, a, b, b, c, d]
Categories (7, object): [a, b, c, d, e, f, g]

I would ideally just like to say:

s.add_categories(s2, take_new=True)

(maybe not the best keyword, but something like this)

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