pandas.api.extensions.ExtensionArray.isna

ExtensionArray.isna(self) → ~ArrayLike

A 1-D array indicating if each value is missing.

Returns:

na_values : Union[np.ndarray, ExtensionArray]

In most cases, this should return a NumPy ndarray. For exceptional cases like SparseArray, where returning an ndarray would be expensive, an ExtensionArray may be returned.

Notes

If returning an ExtensionArray, then

• na_values._is_boolean should be True
• na_values should implement ExtensionArray._reduce()
• na_values.any and na_values.all should be implemented