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You can find a lot of books on www.pythonbooks.org For every level:
My preferred is automate-the-boring-stuff-with-python-practical-programming-for-total-beginners i think is the most useful to understand the core of python.
Hope this helps
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Look up Python on the Amazon books category, some good ones will pop up.
There are a bunch of free python books/ebooks. I suggest “Learn Python the Hard Way”.