Code Cell
A cell holding source code (Python by default) run by the active kernel.
- Last expression auto-displays unless trailing semicolon.
- Stamped with In[N] execution counter.
- No print() needed for quick inspections.
When to use: Anywhere computation, model fitting, or data manipulation happens.
Example: A cell with `import pandas as pd` and `df.head()` last shows a formatted DataFrame inline.