<jupyter_start><jupyter_text>Notebook Exercises  Notebook UI  Part 1 Create a new Notebook and create a couple of cells that contain simple Python expressions. Practice shifting between command and edit mode a few times, going back to edit existing cells.Try using `time.sleep(2)` and watch the kernel activity indicator.<jupyter_code>from time import sleep
sleep(2)<jupyter_output><empty_output><jupyter_text>Part 2 Go back to that last Notebook and  add at least one of each cell type.  Practice the following cell operations:* Moving up/down* Cut/Copy/Paste* Merge/Split  Part 3 Go back to that last Notebook and repeat some of those cell operations using keyboard shortcuts:* Inserting cells above/below* Delete cell* Move cell up/down* Cut/copy/paste cell* Changing cell types  External code Go to the [Matplotlib gallery](http://matplotlib.org/gallery.html), view the raw Python code for an example, use `%load` to load it into a cell and then run it.  Make sure you run:    %matplotlib inlinefirst to enable plotting support.If you don't have matplotlib installed, find any other simple python script online (or on your local drive), load it and execute it locally.<jupyter_code># %load soln/load.py
%matplotlib inline

%load https://matplotlib.org/1.2.1/mpl_examples/api/hinton_demo.py<jupyter_output><empty_output>
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