Cell
The basic execution unit of a notebook: a block of code or markdown run independently.
- Three types: code, markdown, raw.
- Each code cell has an execution count In[N].
- Re-run order is rarely the same as document order.
When to use: Iterating quickly on one piece of an analysis without re-running the whole notebook.
Example: Shift+Enter runs and advances. Ctrl+Enter runs in place. ~15 code + 8 markdown cells is typical.