Some feedback - I had a quick skim through the pdf version of the book. I don't know to what extent the generation of the pdf is in your hands.
Page 12: 'function definitioin'. Page 19: Opportunity for introducing 'with' statement. Page 28: 'Python doesnâ€TMt', amusingly in a paragraph discussing character encoding. Page 31: Broken table. Page 38: 'frame —'. Page 52: 'Hey I dont see' - opportunity for escaped apostrophe.