I need help with my python for my machine learning.

I need help with questions like, Feature Selection: use the scikit-learn regression model from sklearn.linear_model with a subset of features to perform linear regression. For feature selection, write a script or function that takes as input the training data, target variable; the model; and any other parameters you find necessary, and returns the optimal percentage of the most informative features to use. Your approach should use k-fold cross-validation on the training data (you can use k=5).