columns = "age sex bmi map tc ldl hdl tch ltg glu".split()

from sklearn.model_selection import train_test_split

X_train, X_test, y_train, y_test = train_test_split(X, Y, test_size=0.2)
print (X_train.shape, y_train.shape)
print (X_test.shape, y_test.shape)