some list operation(#quote from MIT 'introduction to computation and programming using python, Revis

本文介绍了在Python中如何使用不同方法来合并两个列表。通过示例展示了列表连接、extend方法及append方法的区别。列表连接可以简单地将两个列表合并为一个新列表;extend方法则会将一个列表中的元素逐一添加到另一个列表末尾;而append方法是将整个列表作为一个元素添加到现有列表的末尾。

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L1 = [1,2,3]

L2 = [4,5,6]

L3 = L1 + L2

print L3
[1, 2, 3, 4, 5, 6]

L1.extend(L2)

print L1
[1, 2, 3, 4, 5, 6]

L1.append(L2)

print L1
[1, 2, 3, 4, 5, 6, [4, 5, 6]]

Introduction to Python Programming is written for students who are beginners in the field of computer programming. This book presents an intuitive approach to the concepts of Python Programming for students. This book differs from traditional texts not only in its philosophy but also in its overall focus, level of activities, development of topics, and attention to programming details. The contents of the book are chosen with utmost care after analyzing the syllabus for Python course prescribed by various top universities in USA, Europe, and Asia. Since the prerequisite know-how varies significantly from student to student, the book’s overall overture addresses the challenges of teaching and learning of students which is fine-tuned by the authors’ experience with large sections of students. This book uses natural language expressions instead of the traditional shortened words of the programming world. This book has been written with the goal to provide students with a textbook that can be easily understood and to make a connection between what students are learning and how they may apply that knowledge. Features of this book This book does not assume any previous programming experience, although of course, any exposure to other programming languages is useful This book introduces all of the key concepts of Python programming language with helpful illustrations Programming examples are presented in a clear and consistent manner Each line of code is numbered and explained in detail Use of f-strings throughout the book Hundreds of real-world examples are included and they come from fields such as entertainment, sports, music and environmental studies Students can periodically check their progress with in-chapter quizzes that appear in all chapters
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