dask_expr._collection.DataFrame.isna
dask_expr._collection.DataFrame.isna¶
- DataFrame.isna()¶
Detect missing values.
This docstring was copied from pandas.core.frame.DataFrame.isna.
Some inconsistencies with the Dask version may exist.
Return a boolean same-sized object indicating if the values are NA. NA values, such as None or
numpy.NaN
, gets mapped to True values. Everything else gets mapped to False values. Characters such as empty strings''
ornumpy.inf
are not considered NA values (unless you setpandas.options.mode.use_inf_as_na = True
).- Returns
- DataFrame
Mask of bool values for each element in DataFrame that indicates whether an element is an NA value.
See also
DataFrame.isnull
Alias of isna.
DataFrame.notna
Boolean inverse of isna.
DataFrame.dropna
Omit axes labels with missing values.
isna
Top-level isna.
Examples
Show which entries in a DataFrame are NA.
>>> df = pd.DataFrame(dict(age=[5, 6, np.nan], ... born=[pd.NaT, pd.Timestamp('1939-05-27'), ... pd.Timestamp('1940-04-25')], ... name=['Alfred', 'Batman', ''], ... toy=[None, 'Batmobile', 'Joker'])) >>> df age born name toy 0 5.0 NaT Alfred None 1 6.0 1939-05-27 Batman Batmobile 2 NaN 1940-04-25 Joker
>>> df.isna() age born name toy 0 False True False True 1 False False False False 2 True False False False
Show which entries in a Series are NA.
>>> ser = pd.Series([5, 6, np.nan]) >>> ser 0 5.0 1 6.0 2 NaN dtype: float64
>>> ser.isna() 0 False 1 False 2 True dtype: bool