Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Too Many Codes Which Do Not Work!

The first one-third of this book contains information which a beginner like me may quickly but too hastily find very grateful. But the feeling of being grateful will soon give way to a feeling of disappointment and anger as inaccurate code begin to show up one after another, which will make you waste countless hours. If you buy this book and have to go through the same horrible time of frustration as I have, you will agree that the authors have not tested the codes, which may sound quite incredible to you. I do not understand how this book has gotten that many positive feedbacks. I sent e-mails to the publishers to inquire about the codes in the book which did not function. But I haven't heard yet.