def split_train_test(train, test, target):
    """
    (train,test) -> (X_train, X_test, y_train, y_test)
    :param target: target column
    :param train: training set with features and target
    :param test: test set with features and target
    """
    return train.drop(target, axis=1), test.drop(target, axis=1), train[target], test[target]