How do I reset the Jupyter/IPython input prompt numbering?

Question

I just wrote my first extensive Python tutorial using IPython notebooks. All went well, except I did a lot of testing and moving blocks around. How do I reset the In [

Answer 1

Cell > All Output > Clear Clear all In []: numbers but do not reset them back to 1 for the next cell you run.

Kernel > Restart & Clear Output Restart the kernel, clear output, clear In []: numbers and reset them to 1, and clear output.