How can I check source code of a module in Jupyter notebook?

Question

For example, I want to check the source code of a python library, directly in the notebook, is there a way to do that?

Thank you

Answer 1

You can use inspect module (which is built in) - for example you can see the tree module below from scikit-learn.

import inspect
from sklearn import tree
inspect.getsourcelines(tree.tree) 

Answer 2

Type the fully qualified function name, then type ??.