Can anyone explain what these codes mean?

Question

https://code.sololearn.com/ct64dtXfhgvi/?ref=app

Answer 1

Any particular part you're curious about? If you need me to explain all of it, then it may be better/easier to just go through the course on Python instead. That code is all core concepts.

Answer 2

Thank you:) I don’t know what numpy means. So I’m confused about numpy.ones, numpy.zeros. And I have no idea why np.mean samples are not equal to 0.65.
Do these codes have practical use?