Added a new book to Python section of free-programming-books-tr.md (#2664)

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 ### Python
 
+* [Bilgisayar Bilimcisi gibi Düşünmek Python ile Öğrenme 2. Baskı](https://tekrei.github.io/other/bbgd_p/) - Allen B. Downey, Jeff Elkner and Chris Meyers
 * [Python ile Programlama](https://belgeler.yazbel.com/python-istihza/)