Remove pickles from Importing

[markroepke]

This probably isn't that useful at the Introduction level, and people seemed to miss it. This may actually be a good fit for Intermediate section as it relates to saving model objects.

[eswan18]

@bradleyboehmke What do you think about this? I'm of the view that the time we spend on JSON and pickle files probably isn't worth it; we could just point people to pd.read_json and pd.read_pickle. This also is simpler for the students since right now we teach them entirely custom ways of reading these files instead of just using the built-in pandas functions.

[bradleyboehmke]

Completely agree. And if we are going to reduce it to just pandas.read_xxx then we could probably wedge it in as part of another module and find a replacement topic for those 30 minutes.

[eswan18]

Regarding incorporating this material into another module, here's what I'm thinking:

Right now, the "Packages, Modules, Methods, & Functions" section is really more about DataFrames, along with some general info about how functions work. I propose renaming that to "Pandas and DataFrames", keeping the existing material, and adding Importing Data to the end (or near the end).

Finding a place for Exporting Data is tougher. Maybe it should just get squeezed in at the same time since it's so related?