How should I stop a busy cell in an iPython notebook?

Solution 1:

Click on 'Interrupt' under 'Kernel' in the toolbar. Pressing I twice will also do the trick.

Source - Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?

Solution 2:

  1. You can follow 'Kernel' --> 'Interrupt' in the menu bar at the top.
  2. Pressing 'I' to the left of the cell also works. This only works if you're in command mode. If not already enabled, press Esc to enable it.
  3. If you are okay to lose variables,you might restart the session.