Search icon CANCEL
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Modular Programming with Python
Modular Programming with Python

Modular Programming with Python: Introducing modular techniques for building sophisticated programs using Python

eBook
Mex$504.99 Mex$721.99
Paperback
Mex$902.99
Subscription
Free Trial

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Table of content icon View table of contents Preview book icon Preview Book

Modular Programming with Python

Chapter 2. Writing Your First Modular Program

In this chapter, we will use modular programming techniques to implement a non-trivial program. Along the way, we will:

  • Learn about the divide and conquer approach to program design
  • Examine the tasks our program needs to perform
  • Look at the information our program will need to store
  • Apply modular techniques to break our program down into individual parts
  • Figure out how each part can be implemented as a separate Python module
  • See how the various modules work together to implement our program's functionality
  • Follow this process to implement a simple but complete inventory control system
  • See how modular techniques allow you to add functionality to your program while minimizing the changes that need to be made

The inventory control system

Imagine that you have been asked to write a program that allows the user to keep track of the company's inventory—that is, the various items the company has available for sale. For each inventory item, you have been asked to keep track of the product code and the item's current location. New items will be added as they are received, and existing items will be removed once they have been sold. Your program will also need to generate two types of reports: a report listing the company's current inventory, including how many of each type of item there are in each location, and a report that is used to re-order inventory items once they have been sold.

Looking at these requirements, it is clear that there are three different types of information that we will need to store:

  1. A list of the different types of products that the company has for sale. For each product type, we will need to know the product code (sometimes called an SKU number), a description...
Left arrow icon Right arrow icon
Download code icon Download Code

Key benefits

  • The book would help you develop succinct, expressive programs using modular deign
  • The book would explain best practices and common idioms through carefully explained and structured examples
  • It will have broad appeal as far as target audience is concerned and there would be take away for all beginners to Python

Description

Python has evolved over the years and has become the primary choice of developers in various fields. The purpose of this book is to help readers develop readable, reliable, and maintainable programs in Python. Starting with an introduction to the concept of modules and packages, this book shows how you can use these building blocks to organize a complex program into logical parts and make sure those parts are working correctly together. Using clearly written, real-world examples, this book demonstrates how you can use modular techniques to build better programs. A number of common modular programming patterns are covered, including divide-and-conquer, abstraction, encapsulation, wrappers and extensibility. You will also learn how to test your modules and packages, how to prepare your code for sharing with other people, and how to publish your modules and packages on GitHub and the Python Package Index so that other people can use them. Finally, you will learn how to use modular design techniques to be a more effective programmer.

Who is this book for?

This book is intended for beginner to intermediate level Python programmers who wish to learn how to use modules and packages within their programs. While readers must understand the basics of Python programming, no knowledge of modular programming techniques is required.

What you will learn

  • Learn how to use modules and packages to organize your Python code
  • Understand how to use the import statement to load modules and packages into your program
  • Use common module patterns such as abstraction and encapsulation to write better programs
  • Discover how to create self-testing Python packages
  • Create reusable modules that other programmers can use
  • Learn how to use GitHub and the Python Package Index to share your code with other people
  • Make use of modules and packages that others have written
  • Use modular techniques to build robust systems that can handle complexity and changing requirements over time
Estimated delivery fee Deliver to Mexico

Standard delivery 10 - 13 business days

Mex$149.95

Premium delivery 3 - 6 business days

Mex$299.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : May 26, 2016
Length: 246 pages
Edition : 1st
Language : English
ISBN-13 : 9781785884481
Category :
Languages :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
Estimated delivery fee Deliver to Mexico

Standard delivery 10 - 13 business days

Mex$149.95

Premium delivery 3 - 6 business days

Mex$299.95
(Includes tracking information)

Product Details

Publication date : May 26, 2016
Length: 246 pages
Edition : 1st
Language : English
ISBN-13 : 9781785884481
Category :
Languages :

Packt Subscriptions

See our plans and pricing
Modal Close icon
$19.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
$199.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just Mex$85 each
Feature tick icon Exclusive print discounts
$279.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just Mex$85 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total Mex$ 3,036.97
Expert Python Programming
Mex$1004.99
Modular Programming with Python
Mex$902.99
Software Architecture with Python
Mex$1128.99
Total Mex$ 3,036.97 Stars icon

Table of Contents

10 Chapters
1. Introducing Modular Programming Chevron down icon Chevron up icon
2. Writing Your First Modular Program Chevron down icon Chevron up icon
3. Using Modules and Packages Chevron down icon Chevron up icon
4. Using Modules for Real-World Programming Chevron down icon Chevron up icon
5. Working with Module Patterns Chevron down icon Chevron up icon
6. Creating Reusable Modules Chevron down icon Chevron up icon
7. Advanced Module Techniques Chevron down icon Chevron up icon
8. Testing and Deploying Modules Chevron down icon Chevron up icon
9. Modular Programming as a Foundation for Good Programming Technique Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(3 Ratings)
5 star 33.3%
4 star 33.3%
3 star 33.3%
2 star 0%
1 star 0%
skeptic Nov 06, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Great book on a very important topic.Python is complex language with even more complex environment and its module system is the critical part of it. For example Python standard library is structured as a collection of modules. The author gives you an excellent overview of Python module system, gives important recommendation about creation of your own modules (and provide several examples, including generator example in chapter 4, as well as warns about gotchas. Interplay between modules and namespaces covered in Chapter 7 is alone worth several times of the price of the book. for example few understand that the import statement adds the imported module or package to the current namespace, which may or may not be the global namespace. the author also covers the problem of "name masking" in this chapter.Ability to write a large script using your own modules is a very important skill that few books teach. usually intro books on Python try to throw everything that language contains into the sink, creating problems for whose who study the language, even in cases when they already knew some other programming languages such as C++ or Perl. Ability not to cover some features of the language usually are complete absent in authors of such books.Most of the authors of Python books talks a lot about how great Python is, but never explain why. this books explains probably the most important feature of this scripting language which makes is great (actually inhered from Modula 3). Also most intro books suffer from excessive fascination with OO (thanks God this fad is past its peak). This book does not.Publishing of books that are devoted to important topics has great value as:you have nowhere to go to get information that it provides. But it is very risky business. Of cause if you are diligent you can collect this information by reading a dozen of book by extracting and organizing into some presentation relevant parts. But this is the work better reserved for personalities which corresponds to famous Sherlock Holms and it presuppose that you have pretty of time to do it. Usually meeting both of those two conditions is pretty unrealistic.So it takes a certain about of courage to write a book devoted to a single specific feature of Python and the author should be commended for that.That's why I highly recommend this book for anybody who is trying to learn the language. It really allow you to understand a single the most critical feature of the Python language.The book contain 9 chapters. Here are the titles of those chapters:1. Introducing Modular Programming2. Writing Your First Modular Program3. Using Modules and Packages4. Using Modules for Real-World Programming5. Working with Module Patterns6. Creating Reusable Modules7. Advanced Module Techniques8. Testing and Deploying Modules9. Modular Programming as a Foundation for Good Programming TechniqueNOTE: In chapter 8 the author covers unrelated but an important topic about how to prepare your modules to publication and upload them to GitHub. Using GitHub became now very popular among Python programmers and the earlier you learn about this possibility the better.Chapter 8 also covers important topic about installation of Python packages. But unfortunately the coverage is way to brief and does not cover gotchas that you might experience installing such packages as Numpy.I would like to stress it again: currently the book has no competition in the level of coverage of this, probably the most important feature of Python language.
Amazon Verified review Amazon
Mike Driscoll Jun 17, 2016
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Earlier this year or late 2015, Packt Publishing asked me to be technical reviewer for a book called “Modular Programming with Python” by Erik Westra. It sounded really interesting and it ended up being one of the best books I’ve read from Packt. Note that I am the sole technical reviewer of the book.Modular Programming with Python is actually quite fun to read. It is designed to help you learn how to make your code more modular and gives some really good examples. The first chapter begins by going over the way Python itself organizes its modules and packages. It goes on to explain why modular programming can be important and it has a neat example of creating your very own module, which happens to be a caching module.The second chapter is all about creating your first modular program. It takes you through the steps you might go through to design a program in a modular fashion and then actually implements it. During the design phase, the author just stubs out the interface. Then in the implementation phase we get to actually add the code.For chapter three, we learn how modules and packages are initialized. The author also goes over Python’s importing system. We learn how imports work, what relative imports are, controlling what gets imported, circular imports and more.Chapter four is about creating a modular charting package. We learn how to chart using the pillow package, which is a fork of the Python Imaging Library (PIL). Then the author talks about how requirements for a projects change and how we must respond to them. In this example, we need a way to do vector images which pillow doesn’t support. So the author shows how to add the ability to create charts using Reportlab or pillow. This is also a really great chapter.Chapter five looks at modular patterns, like encapsulation, wrappers, etc. I think the part I found most interesting was the portion of the chapter that covered dynamic imports, plugins and hooks.In Chapter six, we learn about reusable modules. The author first describes what a reusable module is and then gives some examples. The rest of the chapter is devoted to creating a reusable module which happens to be a unit conversion module.Chapter seven digs even more into Python’s importing system. It covers such items as optional imports, local imports, adding packages to sys.path, various import “gotchas”, dealing with globals and more. This was actually one of my favorite chapters.For chapter eight, we get a change of pace. It’s all about testing our modules and deploying them. The chapter only gives the basics on unit tests, code coverage and test driven development. The bulk of the chapter is about getting a module ready for publication to Github or the Python Package Index.The final chapter is supposed to demonstrate how modular programming techniques can make the process of programming itself more effective. It gives a pretty short example and wraps up the book.Overall I found this book conveyed its message very well. The code examples are straight-forward and easy to understand. The writing is very good. Much better than what I normally see in Packt publications. I love reading neat or just interesting code and this book has several great examples. I did feel like the book ended a bit abruptly. While I don’t know what should have been added, I just felt like it could have had another chapter or two. Regardless, I do recommend this book to anyone who is having trouble organizing their code.
Amazon Verified review Amazon
CynA Dec 26, 2016
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
This is a great book for understanding how to organize your python applications.The only thing I didn't like was. The author was hell bent on not using classes at all.Like there was an example where using class would have made the examples easier but the author used all functions with globals and locals. It was weird.While I understand that the author probably did that so it would be easier for beginners?But then again when your buying a book about how to program organize your code modularly.Chances are you already know what a class is.I just seriously don't understand the forced avoidance with classes in the examples.Other than that the book is great
Amazon Verified review Amazon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela