Use `pathlib` to get path to `plasma-calculator` notebook (#1613)
Use `pathlib` to get path to `plasma-calculator` notebook (#1613)

* Use pathlib to get calculator path

* Make command a list of strings

* Modify how plasma-calculator gets opened

Co-authored-by: Erik Everson <047c51f7d98d042feebfcc5bac04c8f301860476@gmail.com>

Co-authored-by: Erik Everson <047c51f7d98d042feebfcc5bac04c8f301860476@gmail.com>
StanczakDominik/PlasmaPy