Jupyter Notebook Fundamentals

Jupyter Notebook Overview

• Jupyter Notebook is an open-source web application for creating and sharing documents with live code, equations, visualizations, and narrative text.
• Popular in fields like data analysis, scientific research, machine learning, and education, primarily associated with Python programming.
• Unique feature: integrates code and explanations via Markdown cells, enhancing understanding and communication of programming concepts.

Creating and Running Python Scripts

• Launch Jupyter Notebook from terminal/command prompt using jupyter notebook.
• Create a new notebook by clicking the "New" button and selecting "Python 3".
• Write Python code in cells; code execution is done by pressing Shift + Enter, displaying results below the cell.
• Use Markdown to add comments or explanatory text by changing cell type to "Markdown" in the dropdown menu.

Managing Cells

• New cells can be added using the "+" button in the toolbar, and can be designated as "Code" or "Markdown".
• Cells can be reordered using up/down arrows in the toolbar or command mode shortcuts (A for above, B for below).
• To delete a cell, select it and press D twice while in command mode.
• Entire notebooks can be executed using "Run All" from the "Cell" menu or by running cells individually.

Visualizing and Sharing Output

• Jupyter Notebook displays outputs like printed values, plots, and results directly below the respective code cell.
• Saving can be done by clicking the save icon or navigating to "File" > "Save and Checkpoint".
• Notebooks can be shared by exporting them to PDF/HTML or sharing the notebook file itself.

Shortcut Keys in Jupyter Notebook

• Command Mode Shortcuts:

  • Enter: Switch to edit mode.
  • Shift + Enter: Run current cell, move to next.
  • Ctrl + Enter: Run current cell, stay on same cell.
  • Alt + Enter: Run current cell, insert new cell below.
  • Up Arrow, Down Arrow: Select cells above or below.

• Edit Mode Shortcuts:

  • Tab: Indent or complete code.
  • Shift + Tab: Show function/method signatures and documentation.
  • Ctrl + ]: Indent selected lines or current line.
  • Ctrl + [: Remove indent for selected lines or current line.
  • Ctrl + /: Comment/uncomment selected lines or current line.