Showing line numbers in IPython/Jupyter Notebooks
CTRL - ML toggles line numbers in the CodeMirror area. See the QuickHelp for other keyboard shortcuts.
In more details CTRL - M (or ESC) bring you to command mode, then pressing the L keys should toggle the visibility of current cell line numbers. In more recent notebook versions Shift-L should toggle for all cells.
If you can't remember the shortcut, bring up the command palette Ctrl-Shift+P (Cmd+Shift+P on Mac), and search for "line numbers"), it should allow to toggle and show you the shortcut.
On IPython 2.2.0, just typing l (lowercase L) on command mode (activated by typing Esc) works. See [Help] - [Keyboard Shortcuts] for other shortcuts.
Also, you can set default behavior to display line numbers by editing custom.js
.
Select the Toggle Line Number Option from the View -> Toggle Line Number.
To turn line numbers on by default in all cells at startup I recommend this link. I quote:
Navigate to your jupyter config directory, which you can find by typing the following at the command line:
jupyter --config-dir
From there, open or create the
custom
folder.In that folder, you should find a
custom.js
file. If there isn’t one, you should be able to create one. Open it in a text editor and add this code:define([ 'base/js/namespace', 'base/js/events' ], function(IPython, events) { events.on("app_initialized.NotebookApp", function () { IPython.Cell.options_default.cm_config.lineNumbers = true; } ); } );