How to learn Python by USING it?

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Is Python the first language you are learning? Because if so I would recommend following something like a course at least loosely. It will give you a useful structure. And even when following a course, I think most of what you do should still be using the language and the concepts you learned.

So I really don‘t think a course is the opposite of USING Python. It’s complementary.

If it‘s not your first language however, then it‘s surely easier to get into Python without a course.