installing libraries on conda

Although I've already installed some libraries, Jupyter Notebook doesn;t find them out from time to time.

At that time you'd better switch the way to install them.

 

If you don't use conda, just use :
pip install openpyxl

If you use conda, I'd recommend :
conda install -c anaconda openpyxl

instead of simply conda install openpyxl

Because there are issues right now with conda updating (see GitHub Issue #8842) ; this is being fixed and it should work again after the next release (conda 4.7.6)