Hey, I saw the issue and spent some time piecing together a PR for it. I've never contributed to Python before but this seemed like a good place to start!  

I posted these questions on the PR but I'll echo them here as well.

- Should we only handle the specific exceptions that are created in these two examples? or is there a cleaner, more pythonic way to handle it?

- It doesn't appear that test_sndhdr.py does any testing of bad inputs. Can I add test cases to the test_sndhdr.py file?

Thanks! I'm here to learn so if there's anything I missed please feel free to let me know.