Code runs as pure python but not jupyter notebook

[perfringo]

This code runs fine on Jupyter. However, you will get 'invalid syntax' if you try print quicksort([3, 6, 8, 10, 1, 2, 1]). You have to print(quicksort([3, 6, 8, 10, 1, 2, 1])) because you probably have Python 3 kernel (have a look at Installing the IPython kernel)

You don't need 'print' to have cell output. Just enter 'quicksort([3, 6, 8, 10, 1, 2, 1])' in cell and hit shift + enter.

By default you will have output of last expression in cell:

1 + 1
1 + 2

Output:
3

If you want to have all outputs of expressions in cell at once then you have to run:

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

After that you will have output of all expressions in cell (previous example will produce 2 and 3) without need of 'print'.