Why does the last line in a cell generate output but preceding lines do not?

Given this Jupyter notebook cell:

x = [1,2,3,4,5]
y = {1,2,3,4,5}
x
y

When the cell executes, it generates this output:

{1, 2, 3, 4, 5}

The last line in the cell generates output, the line above it has no effect. This works for any data type, as far as I can tell.

Here’s a snip of the same code as above:

>Solution :

You can change this behaviour with:

from IPython.core.interactiveshell import InteractiveShell
InteractiveShell.ast_node_interactivity = "all"

The reason why only the last line is printed is that the default value of ast_node_interactivity is: last_expr.

You can read more about that here:
https://ipython.readthedocs.io/en/stable/config/options/terminal.html