Stop cell execution in notebook

Sometimes you would like to stop execution of cells. There is a Stop that can be used to stop execution of cells in Jupyter Notebook from Python code.

In this example, you will learn how to use Stop function. We will use Checkbox widget to call Stop function. Cells below called Stop() function will not be executed.

Required packages

You will need mercury package to run this example.

Notebook

In the first cell, please import required packages:

import mercury as mr

Add Checkbox:

should_stop = mr.Checkbox(value=False, label="Should we stop?")

Call Stop() when Checkbox is switched on:

if should_stop.value:
    print("We stop execution here!")
    mr.Stop()

Let's add some code just to see the Stop effect:

print("Some code ...")

The notebook's code in the Jupyter Notebook:

Mercury App

Please start Mercury in the same directory as notebook:

mercury run

You will see the app running at http://127.0.0.1:8000. Below is an animation with Mercury App:

Mercury automatically executes cells after Checkbox update. The Stop() functions stops cells execution.

Notebook from this example is available in the mercury-examples (opens in a new tab) repository.