Read this if outputs are not working in your app

[wch]

If you have taken code from an example and the outputs are not working, it may be because you need an updated version of Shiny.

---

Perhaps your app is supposed to look like this, with a plot

But instead it looks like this, where there's nothing in the place of the plot:

---

In Shiny 0.6.0, released on 2023-10-03, we changed Shiny so that the @output decorator is no longer needed. In the current development version of Shiny (after the 0.6.1 release), we have updated the examples so that they no longer use the @output decorator (#790).

# Old version of code examples
@output
@render.plot
def plt():
    ...


# New version of code examples
@render.plot
def plt():
    ...

If you have copied and pasted code that does not have @output, and are using Shiny 0.5.1 or older, then you might have the problem shown in the screenshot above. (You check your Shiny version at the Python console by running import shiny; shiny.__version__.)

To fix the problem, either:

• Update to a newer version of Shiny (at least 0.6.0)

• or add @output above the render decorators, as in:

  @output
  @render.plot
  def plt():
      ...