Web Reference: pandas.isnull # pandas.isnull(obj) [source] # Detect missing values for an array-like object. This function takes a scalar or array-like object and indicates whether values are missing (NaN in numeric arrays, None or NaN in object arrays, NaT in datetimelike). Parameters: objscalar or array-like Object to check for null or missing values. Returns: Oct 31, 2025 · Pandas provides isnull () and notnull () to detect such values in a DataFrame or Series. isnull (): Returns True for missing (NaN) values and False for non-missing values. Definition and Usage The isnull() method returns a DataFrame object where all the values are replaced with a Boolean value True for NULL values, and otherwise False.
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