ExtensionArray.isna(self) → ~ArrayLike[source]

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

na_valuesUnion[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.


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