Code runs as pure python but not jupyter notebook

[snippsat]

I have this cell with a few lines of code that seems to run fine, under pycharm,

That because you run it with python 2 in PyCharm Configuring Python Interpreter.
As mention bye @ perfringo print() is a function in Python 3.

print(quicksort([3, 6, 8, 10, 1, 2, 1]))

You should run Python 3.6 --> both local and Jupyter Notebook.
Here a couple of tutorials Python 3.6/3.7 and pip installation under Windows | Anaconda.