# Extensions

These are primarily intended for library authors looking to extend pandas objects.

`api.extensions.register_extension_dtype`(cls) | Register an ExtensionType with pandas as class decorator.
`api.extensions.register_dataframe_accessor`(name) | Register a custom accessor on DataFrame objects.
`api.extensions.register_series_accessor`(name) | Register a custom accessor on Series objects.
`api.extensions.register_index_accessor`(name) | Register a custom accessor on Index objects.
`api.extensions.ExtensionDtype` | A custom data type, to be paired with an ExtensionArray.

`api.extensions.ExtensionArray` | Abstract base class for custom 1-D array types.
`arrays.PandasArray`(values[, copy]) | A pandas ExtensionArray for NumPy data.

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