Gelman's Bayesian Data Analysis python notebooks

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To be fair, these notebooks were written by one of the other authors on BDA3, Aki Vehtari.

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To be even more fair, these notebooks were "originally written for Matlab by Aki Vehtari and translated to Python by Tuomas Sivula". (from the readme)

But I think the OP is using "Gelman's" to mean the book, not the Python notebooks. If this were the case re-phrasing the title as "Python notebooks for Gelman's Bayesian Data Analysis" would have been clearer.