Share trexfeathers/iris#92 `demo_1.py` improvements via templating?

[trexfeathers]

trexfeathers/iris#92 (by @trexfeathers) includes changes to demo_1.py. This file is not currently templated, but its parent directory suggests it may be a good candidate. Please either:

• Action this issue with a pull request adding a template file to templates/.
• Close this issue if the file is not a good candidate for templating.