Graded Homework 3

**Grade: 4.5/5**

I'm really impressed by the combination of excellent readability and equally excellent
logic. Great work, Chris! Other than the comments I had, I wouldn't have done anything
differently. 

Also, if you're interested, you should learn about Python's list comprehensions.
You should google it, and afterwards, you can see some examples of it on my [gene_finder]
(https://github.com/abekim/softdes/blob/master/homework/hw3/gene_finder.py)

Once you've read the comments, make a comment to the pull request or send me/Diana an email, letting us know that you've checked them out. Afterwards, close the PR (and optionally delete the graded branch)

#### REMEMBER NOT TO MERGE THESE PRs!