Filip

It is not warning anymore. Repos like [scikit-learn](https://github.com/scikit-learn/scikit-learn) depreciated six: https://github.com/scikit-learn/scikit-learn/pull/12916/files ``` >>> import mglearn Traceback (most recent call last): File "", line 1, in File "/Users/filip/.local/lib/python3.8/site-packages/mglearn/__init__.py", line 1, in...

[plot_interactive_tree.py](https://github.com/amueller/mglearn/blob/92de7a68b58af738be28771e6336d04986e61312/mglearn/plot_interactive_tree.py#L6) `from sklearn.externals.six import StringIO` -> `from io import StringIO ` I made it work in my repo [fork](https://github.com/filipjakubowski/mglearn/commit/942f72a13dd99071b1eb600b61c53142e64c257f).