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The Jupyter Notebook is an interactive computing environment that enables users to author notebook documents that include code, interactive widgets, plots, narrative text, equations, images and even video!
The Jupyter name comes from 3 programming languages: Julia, Python, and R!
The Jupyter Notebook combines three components (from the docs):
The notebook web application: An interactive web application for writing and running code interactively and authoring notebook documents.
Kernels: Separate processes started by the notebook web application that runs users’ code in a given language (e.g. python, R, Julia, Go, and more -- get the full list of kernels from the wiki) and returns output back to the notebook web application. The kernel also handles things like computations for interactive widgets, tab completion and introspection.
Notebook documents: Self-contained documents that contain a representation of all content visible in the notebook web application, including inputs and outputs of the computations, narrative text, equations, images, and rich media representations of objects. Each notebook document has its own kernel.
Put together, Jupyter Notebooks can be used to write 'executable papers' -- some great examples are here:
Analyzing Whale Tracks by Roberto De Almeida
A Reconstruction of 538 2012 Election Model by Skipper Seabold
You can install jupyter notebooks and some key kernels on your computer in a few ways:
Recommended method -- download using Anaconda (make sure you select version 3.*), which gives you jupyter, python 3, and a lot of key python libraries for research: https://www.anaconda.com/download/. After you've finished downloading + installing with Anaconda, you should see an application "Jupyter notebooks" in your list of applications.
If you're comfortable with the terminal:
python3 -m pip install --upgrade pip python3 -m pip install jupyter jupyter notebooks # launches the notebook interface
Jupyter notebooks can be comprised mainly of two types of cells (more can be added with plugins).
Markdown Cells (for narratives):
When run, a markdown cell will display markdown or html that you enter (that means all sort of rich content, including images)
Essential markdown summary: https://daringfireball.net/projects/markdown/syntax
Code Cells (for data cleaning, analysis, visualization, etc.):
Some key jupyter notebook shortcuts:
shift + enter to run an active cell
esc in highlighted cell to toggle command options:
esc + L = show line numbers
esc + M = format cell as Markdown cell
esc + a = insert cell above current cell
esc + b = insert cell below current cell
Check all current variables: run