title: if/else statements vs dictionary
body: <p>If I were to write a statement using dictionary instead of an else statement, how would that be? For example, say I have </p>
  
  <pre><code>def determineRank(years):
       if years == 1:
           return "Freshman"
       elif years == 2:
           return "Sophmore"
       elif years == 3:
           return "Junior"
       else:
           return "Senior"
  </code></pre>
  
  <p>If I were to rewrite this using dictionary, it would be</p>
  
  <pre><code>rank = {"Freshman":1, "Sophmore":2, "Junior":3, "Senior", ???}
  </code></pre>
  
  <p>what number would I write for the else? </p>