Note that you already need to know python before you start here. This course is not structured as an “intro to python”.
As a footnote to Tom’s points about this being a matter of understanding the linear algebra, it’s also helpful to be aware of the notational conventions that Prof Ng uses here when he is writing formulas involving multiplication of vectors and matrices. Here’s a thread which mostly restates what Tom said, but also gives some explanation of the notation that is worth a look.