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A Second Example: Intersecting Sequences
Let’s look at a second function example that does something a bit more useful than multiplying arguments and further illustrates function basics.
In Chapter 13, we coded a for loop that collected items held in common in two strings. We noted there that the code wasn’t as useful as it could be because it was set up to work only on specific variables and could not be rerun later. Of course, we could copy the code and paste it into each place where it needs to be run, but this solution is neither good nor general—we’d still have to edit each copy to support different sequence names, and changing the algorithm would then require changing multiple copies.
