CPU utilisation is confusing

[Bidgey225]

I have a question regarding the CPU utilisation of Python. When running a calculation, the CPU usage for Python sits at about 30%, which I initially thought would mean that only one of my four cores was being fully used. After checking task manager, it seems that all four cores are being used but each at about 30%

How can I enable Python to use all available resources?

(would post images with this but it's my first post and I'm not allowed :/ sorry)