pandas.api.extensions.ExtensionArray.isna#
- ExtensionArray.isna()[source]#
A 1-D array indicating if each value is missing.
- Returns:
- numpy.ndarray or pandas.api.extensions.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 Truena_values should implement
ExtensionArray._reduce()
na_values.any
andna_values.all
should be implemented
Examples
>>> arr = pd.array([1, 2, np.nan, np.nan]) >>> arr.isna() array([False, False, True, True])