Is Python a

We appreciate, but do not require, attribution. An attribution usually includes thetitle, author, publisher, and ISBN. For example: “Learning Python, Third Edition, byMark Lutz. Copyright 2008 O’Reilly Media Inc., 978-0-596-51398-6.”If you feel your use of code examples falls outside fair use or the permission givenabove, feel free to contact us at permissions@oreilly.com.Font ConventionsThis book uses the following typographical conventions:ItalicUsed for email addresses, URLs, filenames, pathnames, and emphasizing newterms when they are first introducedConstant widthUsed for the contents of files and the output from commands, and to designatemodules, methods, statements, and commandsConstant width boldUsed in code sections to show commands or text that would be typed by theuser, and, occasionally, to highlight portions of codeConstant width italicUsed for replaceables and some comments in code sectionsIndicates a syntactic unit that should be replaced with real codeIndicates a tip, suggestion, or general note relating to the nearby text.Indicates a warning or caution relating to the nearby text.In this book’s examples, the % character at the start of a system command line standsfor the system’s prompt, whatever that may be on your machine (e.g., C:\Python25>in a DOS window). Don’t type the % character yourself. Similarly, in interpreterinteraction listings, do not type the >>> and ... characters shown at the start oflines—these are prompts that Python displays. Type just the text after theseprompts. To help you remember this, user inputs are shown in bold font in thisbook. Also, you normally don’t need to type text that starts with a # in listings; asyou’ll learn, these are comments, not executable code.Preface | xli