Page 114 - Beginning Programming with Pyth - John Paul Mueller
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FIGURE 5-3: Line numbers make collaborating with others easier.
Using the Cell Toolbar features
Each cell has specific features associated with it. You can add a cell toolbar button to make these features accessibly by using the options on the View ⇒ Cell Toolbar menu. Figure 5-4 shows how a cell appears with the Edit Metadata button in place.