We can also use `with` statement to contain operations on the file within a block.

Note that we used `a+` mode (standing for append+ mode) to allow appending new content at the end of the file and enable reading at the same time.

There are even [more modes](https://www.geeksforgeeks.org/reading-writing-text-files-python/) you could set when openning the file.

The trick is to check where the pointer is set: if the pointer is set at the end of the file `seek` method is needed to go back to the start of the file.

Here we set `file.seek(0)` to move the pointer back to the first line (line 0) of the file.

```{code-cell} python3