title: How to pass different set of data to train and test without splitting a dataframe. (python)?
body: <p>I have gone through multiple questions that help divide your dataframe into train and test, with scikit, without etc.</p>
  
  <p>But my question is I have 2 different csvs ( 2 different dataframes from different years). I want to use one as train and other as test?</p>
  
  <p>How to do so for LinearRegression / any model? </p>