John E Grayson Books

Python And Tkinter Programming

By John E Grayson, John Grayson, John E. Grayson

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If you are interested in Python and Tkinter, you have probably noticed that although there is some good contributed documentation on the Web, there is not enough to get Tkinter applications up and...

Python与Tkinter编程

By John E Grayson, (美)John E.Grayson著, 陈文志等译, (美)John E. Grayson著 , 陈文志等译, John E Grayson, 陈文志, (美) 格雷森, J.E

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3 (p1): 第1部分基本概念 3 (p1-1): 第1章 Python 3 (p1-1-1): 1.1 Python编程及特点概述 4 (p1-1-1-1): 1.1.1 为什么是Python 4 (p1-1-1-2): 1.1.2 Python能被用于何处 4 (p1-1-2): 1.2 关键字数据类型：表、元组和字典 5 (p1-1-2-1): 1.2.1 表 6 (...

Python And Tkinter Programming : 파이썬과 티-케이-인터 프로그래밍

By John E Grayson

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Javascript In Action

By John E Grayson, John Grayson, Jon Perry, John E. Grayson, Jon Perry

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An informative guide examines the vital issues for programming JavaScript in an open, informed, and illustrated environment, from programming languages, flow contol, and functions, to JavaScript id...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.