python import pandas as pd

data = pd.read_csv

data.fillna

data.fillna, inplace=True)

median = data.median

data.fillna

grp_median = data.groupby.transform

from sklearn.impute import SimpleImputer

imputer = SimpleImputer

data_imputed = pd.DataFrame, columns=data.columns)

from fancyimpute import KNN

knn_imputer = KNN