Breakpoints
After installation these buttons should appear on the toolbar:
The extension adds 8 buttons:
Follow the installation instructions appropriate to your IPython version as explained on the main wiki home pages:
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.