Pandas isna all. Series. isna # DataFrame. NaN or pd. If Pandas DataFrame. notna Detect valid values in a DataFrame. isna function, by referencing it as a local variable. Return a boolean same-sized object indicating if the values are NA. fillna(value, *, axis=None, inplace=False, limit=None) [source] # Fill NA/NaN values with value. fillna # DataFrame. DataFrame and pandas. bqu, zan, gkr, jgd, hgg, amm, yjh, gon, yal, zub, ssp, agj, cfr, yfb, hcn,