title: How do I modify a library in python and use it?
body: <p>To be more specific, I want to modify some functions in <code>scikit-learn</code> and import it to python. But I do not know how to work. </p>
  
  <p>I tried to modify .py files directly from where the sklearn stores in my local directory, but there are some files I could not open to modify, such as those with <code>.cp36-win_amd64</code>. </p>
  
  <p>Any advice would be helpful!</p>