Keys and values are now generators

[PonteIneptique]

Hey Matt,
I am using your course to kickstart mine. As I go through it, I and some of my students remarked few things :

• the new command is jupyter-notebook to run the notebooks.
• keys() and values() methods are generators since 3.4, which can lead to a somewhat antiproductive situation in the classroom

I'll continue as I go forward feeding this kind of information if you wish

[PonteIneptique]

Example if "a" and 's' in mot: is not valid as you cannot combine in with a and. "a" is then True all the time (Chapter 1)