DataFrame Znajdź nan wiersze
df[df.isnull().any(axis=1)]
Selfish Swiftlet
df[df.isnull().any(axis=1)]#return a subset of the dataframe where the column name value == NaN
df.loc[df['column name'].isnull() == True] # to mark NaN column as True
df['your column name'].isnull()