Showing line numbers in IPython/Jupyter Notebooks

Question

Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are in

Answer 1

1.press esc to enter the command mode 2.perss l(it L in lowcase) to show the line number

Answer 2

To turn line numbers on by default in all cells at startup I recommend this link. I quote:

1. Navigate to your jupyter config directory, which you can find by typing the following at the command line:

   jupyter --config-dir
   

2. From there, open or create the custom folder.

3. 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;
               }
           );
       }
   );
   

Answer 3

Was looking for this: Shift-L in JupyterLab 1.0.0

Answer 4

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.

Answer 5

Here is how to know active shortcut (depending on your OS and notebook version, it might change)

Help > Keyboard Shortcuts > toggle line numbers

On OSX running ipython3 it was ESC L

Answer 6

In Jupyter Lab 2.1.5, it is View -> Show Line Numbers.