Sure, here's a toy example (in REPL) that shows how it works.
```python
>>> numbers = [1, 2, 3]
>>> number = 4
>>> more_numbers = [5, 6, 7]
>>> numbers.append(number)
>>> numbers
[1, 2, 3, 4]
>>> numbers.extend(more_numbers)
>>> numbers
[1, 2, 3, 4, 5, 6, 7]
```
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