Following is a link to a solution for MIT OCW 6.189 Mechanical MOOC Homework 3, Exercise 3.4 - More About Dictionaries:
Does anyone have additional solutions to post for comparison?
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Have you posted a 3.3 yet? I can't seem to find it.
I'm not very excited about my solution to that problem, but here it is:
It probably would be more efficient to use two dictionaries - one listing all the classes, and another with a key for each course, with each of those keys mapping to a list of all the classes in that course.
I had more fun with this than the colliding balls, although they were fun once I sorted the formulas. http://ideone.com/58OqMe
I'm still not thinking in Python, you string things together while I step them out. You are setting a good example though :)