Answer: ModuleNotFoundError: No module named 'sklearn'

You can just use pip for installing packages, even when you are using anaconda:

pip install -U scikit-learn scipy matplotlib

This should work for installing the package.

And for Python 3.x just use pip3:

pip3 install -U scikit-learn scipy matplotlib

anaconda install learn matplotlib package pip python python 3 scikit scikit-learn scipy sklearn work