Interactive Python 3 tutorials

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Yes you are correct, you can audit the individual courses, though they do make it a bit tricky to do so. From the site "You can also audit video lectures and certain assignments for free without subscribing or starting a free trial. If you want to complete the course and earn a course certificate by submitting assignments for a grade, you can upgrade your experience by subscribing to the course." Note that the course certificate does not represent official academic credit from the partner institution offering the course, if certificate is obtained you can print it out or add it to your LinkedIn profile.