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There is a section in the beginning of the book that explains some of the differences:
This second edition is NOT at all like the first.
This is an update to the first edition of Head First Python, which published late in 2010.
Although that book and this one share the same author, he’s now older and (hopefully)
wiser, and thus, decided to completely rewrite the first edition’s content for this edition.
So...everything is new: the order is different, the content has been updated, the examples
are better, and the stories are either gone or have been replaced. We kept the cover—
with minor amendments—as we figured we didn’t want to rock the boat too much. It’s
been a long six years...we hope you enjoy what we’ve come up with.
I hope that helps,
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