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Asked: 2024-09-26T16:01:20+05:30 In: ,

I’m encountering an issue where I receive an error stating that “ipython is not defined” while running JavaScript code in a JupyterLab environment. Despite following the usual setup procedures, it seems the IPython library isn’t recognized. What steps can I take to resolve this problem?

I’ve been stuck on this issue for a while, and I’m hoping some of you might have run into something similar or know how to fix it. So, here’s the situation: I’m working in a JupyterLab environment, and I’m trying to run some JavaScript code, but I keep hitting this annoying error that says “ipython is not defined.”

At first, I thought it might be a simple typo or something, but I’ve double-checked to make sure everything is spelled correctly. I’ve gone through all the usual setup steps too. I made sure that the IPython library is installed and correctly set up. Everything else in my environment seems fine for the most part; I can run Python code without any issues.

It’s just this JavaScript code that seems to be throwing a fit. I mean, does the IPython library even come into play when running JavaScript? I was under the impression that JupyterLab should handle both languages seamlessly. I tried restarting JupyterLab, clearing the output, and even creating a new notebook just in case something was glitched out. But no luck!

I’ve looked online for solutions, and while I found some guides on setting up JavaScript in Jupyter, none of them specifically addressed this error message. If I’m missing something super obvious here, I’d love to have someone point it out.

Has anyone else experienced this? If so, how did you resolve it? Or does somebody have a clue about whether I need to do anything special when working with the IPython library inside a JavaScript context?

I’d appreciate any tips or suggestions you can offer. It’s just frustrating because I feel like I’m hitting a wall, and I really want to make progress with my project. Thanks in advance for any help you can provide!

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    2 Answers



    1. JupyterLab JavaScript Issue

      It sounds like you’re really frustrated with this problem, and I totally get it. It can be super annoying when things don’t work the way they should.

      So, about that “ipython is not defined” error—yeah, that can be a bit puzzling. First off, I just want to clarify that the IPython library is mainly for Python, so it doesn’t directly mix with JavaScript code. JupyterLab is supposed to manage multiple languages, but you might be hitting a snag with the way JavaScript is set up.

      One thing you might want to check is how you’re trying to run the JavaScript. Unlike Python, running JavaScript in a Jupyter notebook requires you to use a magic command like %javascript at the top of your cell. So it should look something like this:

      %javascript
console.log("Hello from JavaScript!");

      If you’re just trying to run plain JS without that magic command, that could be where the error is coming from. Jupyter needs to know you’re doing JavaScript stuff.

      Another thing: make sure you’re not mixing your languages in a single cell. Keep Python and JavaScript in separate cells to avoid confusion.

      Also, if you see anything in your cell that says %%javascript at the start, that’s another way to indicate that you’re going to be working with JavaScript, so check that out too.

      If none of this helps, maybe try updating your JupyterLab and related packages. Sometimes things get a little wonky with older versions.

      I hope this helps you out a bit! Hang in there!



    2. The error message “ipython is not defined” typically indicates that you’re trying to reference a JavaScript variable or library that isn’t available in the current context of your notebook. In JupyterLab, while it seamlessly supports both Python and JavaScript, these two languages operate in different environments. JavaScript runs in the browser’s execution context, while IPython is primarily a Python-based toolkit. If you’re attempting to access the `ipython` variable directly within a JavaScript cell, that reference won’t resolve correctly because IPython does not inject any global variables into the JavaScript environment. To execute JavaScript without such errors, ensure that you’re not inadvertently mixing contexts, and use standard JavaScript syntax and libraries available to the browser.

      To troubleshoot this situation further, check if you’re using any IPython-specific widgets or features designed for Python environments. If you’re trying to use JavaScript to manipulate notebooks or interact with Python code, consider leveraging Jupyter’s built-in support for executing Python code from JavaScript using `Jupyter.notebook.kernel.execute()`. Another possibility is using the `%%javascript` magic command at the top of your notebook cell to indicate that the cell should be treated as JavaScript. This approach may help clarify the execution context and could potentially alleviate the error you’re encountering. If issues persist despite these adjustments, reviewing your JavaScript code for outside library dependencies and ensuring everything is properly initialized can also lead to a resolution.


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