CS50: Web Programming with Python and JavaScript
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Start here if you have never written Python.
An introduction to programming using Python, covering functions, variables, conditionals, loops, exceptions, libraries, unit tests, file I/O, regular expressions and object-oriented programming.
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If you have never written Python, start here. It is thorough, well taught, and the problem sets are the reason it works.
Harvard University publishes a large share of its computer science and data science teaching openly, through Harvard Online and edX. The CS50 family is its best known series and is free to take, with a paid certificate option.
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Regression and prediction from first principles.
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Plain-language grounding for everyone else.
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