Document

add_categories(self, new_categories, inplace=<no_default>)

:None:None:`new_categories` will be included at the last/highest place in the categories and will be unused directly after this call.

Parameters

new_categories : category or list-like of category: The new categories to be included.
inplace : bool, default False: Whether or not to add the categories inplace or return a copy of this categorical with added categories.

deprecated

Raises

ValueError: If the new categories include old categories or do not validate as categories

Returns

cat : Categorical or None: Categorical with new categories added or None if inplace=True .

Add new categories.

Examples

This example is valid syntax, but we were not able to check execution

>>> c = pd.Categorical(['c', 'b', 'c'])
... c
['c', 'b', 'c']
Categories (2, object): ['b', 'c']

This example is valid syntax, but we were not able to check execution

>>> c.add_categories(['d', 'a'])
['c', 'b', 'c']
Categories (4, object): ['b', 'c', 'd', 'a']

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

pandas.core.arrays.categorical.Categorical.set_categories pandas.core.arrays.categorical.Categorical.remove_categories pandas.core.arrays.categorical.Categorical.rename_categories pandas.core.arrays.categorical.Categorical.remove_unused_categories pandas.core.arrays.categorical.Categorical.reorder_categories

Local connectivity graph

Hover to see nodes names; edges to Self not shown, Caped at 50 nodes.

Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)

SVG is more flexible but power hungry; and does not scale well to 50 + nodes.

All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them