Wrap Up

What we covered

• Shiny’s input → output → reactivity model
• Building and running your first app
• @reactive.calc for shared computations
• Dashboard layouts: sidebars, columns, cards, value boxes
• Shiny modules: reuse UI + server logic without repeating yourself
• Testing with Playwright
• Deploying to Posit Connect Cloud

Handling messy input & secrets

We didn’t have time to cover these, but you’ll want them soon:

• req(): stop execution until an input is valid/present, instead of erroring
  • https://shiny.posit.co/py/api/core/req.html
• ui.notification_show(): tell users what’s wrong instead of failing silently
  • https://shiny.posit.co/py/components/display-messages/notifications/
• python-dotenv: keep API keys and other secrets out of your code with a .env file
  • https://pypi.org/project/python-dotenv/

Other cool components to explore

• File upload / download
  • https://shiny.posit.co/py/components/inputs/file/
  • https://shiny.posit.co/py/api/core/render.download.html
• Multi-page apps with navbars (ui.page_navbar(), ui.nav_panel())
  • https://shiny.posit.co/py/layouts/navbars/
• Progress bars for long-running tasks
  • https://shiny.posit.co/py/components/display-messages/progress-bar/
• Full component gallery
  • https://shiny.posit.co/py/components/

This workshop

Everything from today:

https://github.com/chendaniely/scipy-2026-shiny

Bonus material (AI + LLM dashboards with chatlas, shinychat, querychat) is in the “🎁 Bonus” section of the sidebar. Try it on your own time.

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