dietnb 0.2.1

Automatically save matplotlib figures to files and link them in Jupyter notebooks instead of embedding them.

dietnb

dietnb addresses the issue of large .ipynb file sizes caused by matplotlib figures being embedded as Base64 data. By saving plots as external PNG files and embedding only image links, dietnb keeps your notebooks lightweight and improves manageability.

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Key Features

• Minimized Notebook Size: Significantly reduces .ipynb file bulk by storing matplotlib figures as external PNG files.
• Automatic Image Folder Management: Creates and manages image storage directories (e.g., [NotebookFileName]_dietnb_imgs) relative to the notebook's location. When you move the notebook and the folder together, the <img> tags continue to work because only relative paths are stored. If detection fails, the default dietnb_imgs folder in the working directory is used.
• Automatic Image Updates: Registers per-directory/per-cell execution counts to replace old PNGs when a cell reruns, preventing stale images from piling up.
• Image Cleanup Function: The dietnb.clean_unused() function consults the execution registry to remove unreferenced image files from the active session.
• Simple Auto-Activation: The dietnb install command configures dietnb to activate automatically when IPython and Jupyter environments start.

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Installation and Activation

1. Install the dietnb package

Execute the following command in your terminal:

pip install dietnb

2. Choose an Activation Method

A. Automatic Activation (Recommended) Run the following command in your terminal once:

dietnb install

This creates a startup script (00-dietnb.py) in your IPython profile directory. After restarting your Jupyter kernel, dietnb will be activated automatically. Images will be saved to a folder based on the notebook's path or to the default dietnb_imgs directory.

To disable automatic activation later, run:

dietnb uninstall

This removes the startup script.

B. Manual Activation (Per Notebook) If you prefer to use dietnb only for specific notebooks or do not want automatic activation, add the following code at the top of your notebook to activate it manually:

import dietnb
dietnb.activate()

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Example Usage

With dietnb active, use your matplotlib code as usual.

import matplotlib.pyplot as plt
import numpy as np

# Create a plot
x = np.linspace(0, 10, 100)
plt.plot(x, np.sin(x), label='sin(x)')
plt.plot(x, np.cos(x), label='cos(x)')
plt.title("Trigonometric Functions")
plt.xlabel("X-axis")
plt.ylabel("Y-axis")
plt.legend()

plt.show() # On show(), the image is saved to a file, and a link is displayed in the notebook.

Generated images can be found in the [NotebookFileName]_dietnb_imgs folder alongside your notebook (with relative links), or in the dietnb_imgs folder.

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Cleaning Unused Image Files

To remove image files that are no longer in use, execute the following function in a notebook cell:

import dietnb
dietnb.clean_unused()

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License

MIT License. See LICENSE for details.

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한국어 README (Korean README)