notnull() function Detect existing (non-missing) values. This function return a boolean object having the size same as the object, indicating if the values are missing values or not. Non-missing values get mapped to True.

IS NOT NULL condition pandas?

notnull. Detect non-missing values for an array-like object. This function takes a scalar or array-like object and indicates whether values are valid (not missing, which is NaN in numeric arrays, None or NaN in object arrays, NaT in datetimelike).

How do I check if a pandas is null?

Pandas’ own implementation basically just checks if len(df. columns) == 0 or len(df. index) == 0 , and never looks at values directly.