Page 90 - Beginning Programming with Pyth - John Paul Mueller
P. 90
FIGURE 4-14: Cells execute individually in Notebook.
Note that the first cell also has a In [1]: entry. This entry is still from the previous session. Place your cursor in that cell and click Run. Now the cell contains In [2]:, as shown in Figure 4-15. However, note that the next cell hasn't been selected and still contains the In [1]: entry.
