After installation these buttons should appear on the toolbar:

The extension adds 8 buttons:

Installation

Follow the installation instructions appropriate to your IPython version as explained on the main wiki home pages:

• Home generic
• Home 4.x (Jupyter)
• Home 3.x
• Home 2.x

Internals

The extension registers a codemirror gutter. Currently, this makes it incompatible with the codefolding-extension, as both extensions react on gutter clicks.

A breakpoint flag is stored as metadata in each cell: cell.metadata.run_control.breakpoint = true | false

As metadata is saved in the IPython notebook, all breakpoints are saved, too.