Throughout the book, we've used icons in the left margin to call your attention to points that are particularly important.
New ^ This icon indicates that the material discussed is new to Python 2.0 or Python 2.1. Feature
Note The Note icons tell you that something is important— perhaps a concept that may help you master the task at hand or something fundamental for understanding subsequent material.
Tip icons indicate a more efficient way of doing something or a technique that may not be obvious.
Caution Caution icons mean that the operation we're describing can cause problems if you're not careful.
Cross- We use the Cross-Reference icon to refer you to other sections or chapters that
Reference have more to say on a subject.
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