In order to use Python with ILWIS via a Python editor and independent from ILWIS user interface, you also need to download and install ILWIS Python extension. Note that, use of the available Python Console in ILWIS main window does not require any extra download of the Python extension.
To do so:
There are 3 releases available for the latest 3 Python versions (Python 3.3, 3.4, 3.5). You need to download the one that compatible with the version of Python installed on your computer.
Select the ILWISObjects-beta3.0-forPython3.x-32bit.exe compatible with installed Python version on your computer
Save the download on your disck
How to install ILWIS objects extension is described in Installation guide