Comments on the syllabus

Comments on this document:

• I would move apply and applymap later. It's a more advanced concept I think. Also, a lot of times you can just do things like df['new'] = df['old'] ** 2 (or whatever)
• For the missing values (and one-hot encoding), there's the pandas way and the scikit-learn way. We should decide which one we're doing. If the latter, I guess we don't need to teach the pandas way?
• Do we want/need regular expressions?
• Module 6 looks too full to me. Functions are easily their own module IMO. I might move a bunch of it to Module 8.
• Do we want/need broadcasting? For module 7, this might be their first time thinking about array shapes and dimensions.

Thanks @hfboyce !

cc @ttimbers

Start with docs/syllabus-learning-outcomes.md and review the comments about apply, applymap, missing values, one-hot encoding, regular expressions, functions, and broadcasting. Done means reaching and documenting clear decisions about the module placement and topics to teach.