Resolve Javascript error: ipython is not defined

Resolve Javascript error: ipython is not defined

In this article, We will learn about the causes of the error “Javascript error: ipython is not defined” and the easiest way to fix it.

“Javascript error: ipython is not defined” error is caused by incorrect installation of IPython or incorrect inclusion of its JavaScript libraries and can be fixed by ensuring proper IPython installation in Command Prompt or Jupyter Notebook

Introduction

The error message Javascript error: ipython is not defined can be caused due to a variety of factors, including:

  • Improper installation of IPython
  • IPython incompatible with Jupyter notebook
  • Incorrectly including the IPython JavaScript libraries
  • Improper JavaScript environment configuration in JupyterLab

In this article, we will explore various possible solutions for resolving this error message. Before going into depth, let’s clarify the definition of IPython.

What is IPython?

IPython (Interactive Python) is an enhanced interactive shell for Python. It was created to provide a more interactive and efficient environment for Python developers compared to the standard Python shell. IPython provides a number of features that make it a powerful tool for scientific computing, data analysis, and data visualization.

By using it, you can increase your productivity and write cleaner, more effective code.

1. Improper installation of IPython

The JavaScript error: IPython is not defined error in Python usually occurs when you are trying to run JavaScript code in a Python environment. In other words, you are trying to access the IPython object in a Python script or Jupyter notebook cell, but the IPython JavaScript libraries are not properly installed on your system. First, verify if the IPython JavaScript library is properly installed on your system or not.

To verify this you can run the following command in your terminal or command prompt:

IPython

The execution of the above command should start the IPython shell, which you can use to write, test, and debug your Python code. As shown below:

Ipython

If you use IPython in a web-based environment, such as a Jupyter Notebook, you do not need to install it separately. As IPython is already installed by default in Jupyter Notebook. If for some reason IPython is not installed in your Jupyter Notebook environment, you can install it by using the pip installer. 

Run the following command in your terminal or command prompt:

pip install ipython
install ipython

2. IPython incompatible with Jupyter notebook

You may encounter errors if IPython is incompatible with Jupyter Notebook. To resolve the issue you need to update IPython. Make sure that you have the latest version of IPython installed. 

Run the following command in your terminal or command prompt to update IPython:

pip install --upgrade ipython
pip install --upgrade ipython

If updating IPython doesn’t resolve the issue, try reinstalling Jupyter Notebook. You can do this by running the following command in your terminal or command prompt:

pip install --upgrade jupyter
--upgrade jupyter

Note: that it’s important to ensure that the versions of IPython and Jupyter Notebook you have installed are compatible with each other, as well as with the version of Python you are using.

3. Incorrectly including the IPython JavaScript libraries

if you are trying to use IPython in a web-based environment, such as a Jupyter Notebook, make sure that you have correctly loaded and included the IPython JavaScript libraries. Sometime we may do spelling mistakes. So, check the syntax or spelling carefully.

4. Improper JavaScript environment configuration in JupyterLab

If the proper JavaScript environment is not configured in JupyterLab, errors can occur. One example is the Javascript Error: IPython is not defined error message. This error can arise when attempting to run interactive code or plots in JupyterLab without the necessary JavaScript support. Like, while plotting matplotlib plots in Jupyter Labs using the jupyter-matplotlib extension. Because Jupyter Lab does support matplotlib through the jupyter-matplotlib extension

To enable the creation of interactive plots using matplotlib, you can use the ipympl extension, which relies on NodeJS to function. 

  • To install the ipympl using run the following commands in JupyterLab.
pip install ipympl

If you are using JupyterLab 2 run this command:

pip install nodejs

jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter labextension install jupyter-matplotlib
  • If for some reason pip commands do not work for you you can also use conda. It is a comprehensive package manager with features for managing dependencies across multiple languages and platforms.
conda install -c conda-forge ipympl

Run the following command if you use JupyterLab 2:

conda install nodejs
jupyter labextension install @jupyter-widgets/jupyterlab-manager
jupyter lab build

# Later, if updating a previous Lab install:

conda install ipympl
jupyter lab build

Usage

After successful installation, to enable the ipympl, use the following matplotlib Jupyter magic command to run matplotlib plots in JupyterLab :

%matplotlib widget

Conclusion

In conclusion, the Javascript error: ipython is not defined error can be caused by various factors, such as incorrect installation of IPython or the incorrect inclusion of its JavaScript libraries. To fix this error, one can try different solutions, including verifying compatibility with Jupyter Notebook and ensuring proper IPython installation in Command Prompt or Jupyter Notebook.

Additionally, this error may occur when using matplotlib plots in JupyterLab through the jupyter-matplotlib extension. To prevent this error, it’s essential to set up the proper JavaScript environment in JupyterLab when running interactive code or plots. By following the solutions presented in this article, you can efficiently fix this error and resume your IPython work with minimal disruption.

Good Luck with your Learning !!

Related Topics:

Conda Command not Found

List of Lists in Python

Python was not found; run without arguments

Coding Spell Python Journey | About Us 

Jerry Richard R
Follow me