Pythonic ways to teach students

We seem to be gathering more and more pythonic things we want to teach the students. Let's use this issue to track everything else we may still run in to and then decide which ones are must-have and which ones are nice-to-have once we have collected a few.

• List comprehensions (currently planned to be included in "basic skills")
• Dict comprehensions
• String interpolation (as pointed out in !12 (merged))