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Home > Web Development > Web Services > Django RESTful Web Services
Django RESTful Web Services
Django RESTful Web Services

Django RESTful Web Services: The easiest way to build Python RESTful APIs and web services with Django

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Profile Icon Gaston C. Hillar
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Django RESTful Web Services

Working with Models, Migrations, Serialization, and Deserialization

In this chapter, we will define the requirements for our first RESTful Web Service. We will start working with Django, Django REST framework, Python, configurations, models, migrations, serialization, and deserialization. We will create a RESTful Web Service that performs CRUD (short for Create, Read, Update and Delete) operations on a simple SQLite database. We will be:

  • Defining the requirements for our first RESTful Web Service
  • Creating our first model
  • Running our initial migration
  • Understanding migrations
  • Analyzing the database
  • Understanding Django tables
  • Controlling, serialization, and deserialization
  • Working with the Django shell and diving deeply into serialization and deserialization

Defining the requirements for our first RESTful Web Service

Imagine a team of developers working on a mobile app for iOS and Android and requires a RESTful Web Service to perform CRUD operations with toys. We definitely don't want to use a mock web service and we don't want to spend time choosing and configuring an ORM (short for Object-Relational Mapping). We want to quickly build a RESTful Web Service and have it ready as soon as possible to start interacting with it in the mobile app.

We really want the toys to persist in a database but we don't need it to be production-ready. Therefore, we can use the simplest possible relational database, as long as we don't have to spend time performing complex installations or configurations.

Django REST framework, also known as DRF, will allow us to easily accomplish this task and start making HTTP requests to the first...

Creating our first model

Now, we will create a simple Toy model in Django, which we will use to represent and persist toys. Open the toys/models.py file. The following lines show the initial code for this file with just one import statement and a comment that indicates we should create the models:

from django.db import models 
 
# Create your models here.

The following lines show the new code that creates a Toy class, specifically, a Toy model in the toys/models.py file. The code file for the sample is included in the hillar_django_restful_02_01 folder in the restful01/toys/models.py file:

from django.db import models 
 
 
class Toy(models.Model): 
    created = models.DateTimeField(auto_now_add=True) 
    name = models.CharField(max_length=150, blank=False, default='') 
    description = models.CharField(max_length=250, blank=True, default='') 
    toy_category...

Running our initial migration

Now, it is necessary to create the initial migration for the new Toy model we recently coded. We will also synchronize the SQLite database for the first time. By default, Django uses the popular self-contained and embedded SQLite database, and therefore we don't need to make changes in the initial ORM configuration. In this example, we will be working with this default configuration. Of course, we will upgrade to another database after we have a sample web service built with Django. We will only use SQLite for this example.

We just need to run the following Python script in the virtual environment that we activated in the previous chapter. Make sure you are in the restful01 folder within the main folder for the virtual environment when you run the following command:

    python manage.py makemigrations toys

The following lines show the output...

Analyzing the database

In most modern Linux distributions and macOS, SQLite is already installed, and therefore you can run the sqlite3 command-line utility.

In Windows, if you want to work with the sqlite3.exe command-line utility, you have to download the bundle of command-line tools for managing SQLite database files from the downloads section of the SQLite webpage at http://www.sqlite.org/download.html. For example, the ZIP file that includes the command-line tools for version 3.20.1 is sqlite-tools-win32-x8 6-3200100.zip. The name for the file changes with the SQLite version. You just need to make sure that you download the bundle of command-line tools and not the ZIP file that provides the SQLite DLLs. After you unzip the file, you can include the folder that includes the command-line tools in the PATH environment variable, or you can access the sqlite3.exe command...

Controlling, serialization, and deserialization

Our RESTful Web Service has to be able to serialize and deserialize the Toy instances into JSON representations. In Django REST framework, we just need to create a serializer class for the Toy instances to manage serialization to JSON and deserialization from JSON. Now, we will dive deep into the serialization and deserialization process in Django REST framework. It is very important to understand how it works because it is one of the most important components for all the RESTful Web Services we will build.

Django REST framework uses a two-phase process for serialization. The serializers are mediators between the model instances and Python primitives. Parser and renderers handle as mediators between Python primitives and HTTP requests and responses. We will configure our mediator between the Toy model instances and Python primitives...

Working with the Django shell and diving deeply into serialization and deserialization

We can launch our default Python interactive shell in our virtual environment and make all the Django project modules available before it starts. This way, we can check that the serializer works as expected. We will do this to understand how serialization works in Django.

Run the following command to launch the interactive shell. Make sure you are within the restful01 folder in the terminal, Command Prompt, or Windows Powershell:

python manage.py shell

You will notice a line that says (InteractiveConsole) is displayed after the usual lines that introduce your default Python interactive shell. The following screenshot shows the Django shell launched in a Windows command prompt:

Enter the following code in the Python interactive shell to import all the things we will need to test the Toy model...

Defining the requirements for our first RESTful Web Service

Imagine a team of developers working on a mobile app for iOS and Android and requires a RESTful Web Service to perform CRUD operations with toys. We definitely don't want to use a mock web service and we don't want to spend time choosing and configuring an ORM (short for Object-Relational Mapping). We want to quickly build a RESTful Web Service and have it ready as soon as possible to start interacting with it in the mobile app.

We really want the toys to persist in a database but we don't need it to be production-ready. Therefore, we can use the simplest possible relational database, as long as we don't have to spend time performing complex installations or configurations.

Django REST framework, also known as DRF, will allow us to easily accomplish this task and start making HTTP requests to the first version of our RESTful Web Service. In this case, we will work with a very simple SQLite database, the default database for a new...

Creating our first model

Now, we will create a simple Toy model in Django, which we will use to represent and persist toys. Open the toys/models.py file. The following lines show the initial code for this file with just one import statement and a comment that indicates we should create the models:

from django.db import models 
 
# Create your models here.

The following lines show the new code that creates a Toy class, specifically, a Toy model in the toys/models.py file. The code file for the sample is included in the hillar_django_restful_02_01 folder in the restful01/toys/models.py file:

from django.db import models 
 
 
class Toy(models.Model): 
    created = models.DateTimeField(auto_now_add=True) 
    name = models.CharField(max_length=150, blank=False, default='') 
    description = models.CharField(max_length=250, blank=True, default='') 
    toy_category = models.CharField(max_length=200, blank=False, default='') 
    release_date = models.DateTimeField() 
    was_included_in_home...
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Key benefits

  • Create efficient real-world RESTful web services with the latest Django framework
  • Authenticate, secure, and integrate third-party packages efficiently in your Web Services
  • Leverage the power of Python for faster Web Service development

Description

Django is a Python web framework that makes the web development process very easy. It reduces the amount of trivial code, which simplifies the creation of web applications and results in faster development. It is very powerful and a great choice for creating RESTful web services. If you are a Python developer and want to efficiently create RESTful web services with Django for your apps, then this is the right book for you. The book starts off by showing you how to install and configure the environment, required software, and tools to create RESTful web services with Django and the Django REST framework. We then move on to working with advanced serialization and migrations to interact with SQLite and non-SQL data sources. We will use the features included in the Django REST framework to improve our simple web service. Further, we will create API views to process diverse HTTP requests on objects, go through relationships and hyperlinked API management, and then discover the necessary steps to include security and permissions related to data models and APIs. We will also apply throttling rules and run tests to check that versioning works as expected. Next we will run automated tests to improve code coverage. By the end of the book, you will be able to build RESTful web services with Django.

Who is this book for?

This book is for Python developers who want to create RESTful web services with Django; you need to have a basic working knowledge of Django but no previous experience with RESTful web services is required.

What you will learn

  • • The best way to build a RESTful Web Service or API with Django and the Django REST Framework
  • • Develop complex RESTful APIs from scratch with Django and the Django REST Framework
  • • Work with either SQL or NoSQL data sources
  • • Design RESTful Web Services based on application requirements
  • • Use third-party packages and extensions to perform common tasks
  • • Create automated tests for RESTful web services
  • • Debug, test, and profile RESTful web services with Django and the Django REST Framework
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Publication date : Jan 25, 2018
Length: 326 pages
Edition : 1st
Language : English
ISBN-13 : 9781788833929
Category :
Web Development
Languages :
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Concepts :
Web Services
Tools :
Django

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Publication date : Jan 25, 2018
Length: 326 pages
Edition : 1st
Language : English
ISBN-13 : 9781788833929
Category :
Web Development
Languages :
Python
Concepts :
Web Services
Tools :
Django

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Table of Contents

12 Chapters
Installing the Required Software and Tools Chevron down icon Chevron up icon
Installing the Required Software and Tools
Creating a virtual environment with Python 3.x and PEP 405
Installing Django and Django REST frameworks in an isolated environment
Creating an app with Django
Installing tools
Test your knowledge
Summary
Working with Models, Migrations, Serialization, and Deserialization Chevron down icon Chevron up icon
Working with Models, Migrations, Serialization, and Deserialization
Defining the requirements for our first RESTful Web Service
Creating our first model
Running our initial migration
Analyzing the database
Controlling, serialization, and deserialization
Working with the Django shell and diving deeply into serialization and deserialization
Test your knowledge
Summary
Creating API Views Chevron down icon Chevron up icon
Creating API Views
Creating Django views combined with serializer classes
Understanding CRUD operations with Django views and the request methods
Routing URLs to Django views and functions
Launching Django's development server
Making HTTP POST requests with Postman
Test your knowledge
Summary
Using Generalized Behavior from the APIView Class Chevron down icon Chevron up icon
Using Generalized Behavior from the APIView Class
Taking advantage of model serializers
Understanding accepted and returned content types
Making unsupported HTTP OPTIONS requests with command-line tools
Understanding decorators that work as wrappers
Using decorators to enable different parsers and renderers
Taking advantage of content negotiation classes
Making supported HTTP OPTIONS requests with command-line tools
Working with different content types
Sending HTTP requests with unsupported HTTP verbs
Test your knowledge
Summary
Understanding and Customizing the Browsable API Feature Chevron down icon Chevron up icon
Understanding and Customizing the Browsable API Feature
Understanding the possibility of rendering text/HTML content
Using a web browser to work with our web service
Making HTTP GET requests with the browsable API
Making HTTP POST requests with the browsable API
Making HTTP PUT requests with the browsable API
Making HTTP OPTIONS requests with the browsable API
Making HTTP DELETE requests with the browsable API
Test your knowledge
Summary
Working with Advanced Relationships and Serialization Chevron down icon Chevron up icon
Working with Advanced Relationships and Serialization
Defining the requirements for a complex RESTful Web Service
Creating a new app with Django
Configuring a new web service
Defining many-to-one relationships with models.ForeignKey
Installing PostgreSQL
Running migrations that generate relationships
Analyzing the database
Configuring serialization and deserialization with relationships
Defining hyperlinks with serializers.HyperlinkedModelSerializer
Working with class-based views
Taking advantage of generic classes and viewsets
Generalizing and mixing behavior
Working with routing and endpoints
Making requests that interact with resources that have relationships
Test your knowledge
Summary
Using Constraints, Filtering, Searching, Ordering, and Pagination Chevron down icon Chevron up icon
Using Constraints, Filtering, Searching, Ordering, and Pagination
Browsing the API with resources and relationships
Defining unique constraints
Working with unique constraints
Understanding pagination
Configuring pagination classes
Making requests that paginate results
Working with customized pagination classes
Making requests that use customized paginated results
Configuring filter backend classes
Adding filtering, searching, and ordering
Working with different types of Django filters
Making requests that filter results
Composing requests that filter and order results
Making requests that perform starts with searches
Using the browsable API to test pagination, filtering, searching, and ordering
Test your knowledge
Summary
Securing the API with Authentication and Permissions Chevron down icon Chevron up icon
Securing the API with Authentication and Permissions
Understanding authentication and permissions in Django, the Django REST framework, and RESTful Web Services
Learning about the authentication classes
Including security and permissions-related data to models
Working with object-level permissions via customized permission classes
Saving information about users that make requests
Setting permission policies
Creating the superuser for Django
Creating a user for Django
Making authenticated requests
Making authenticated HTTP PATCH requests with Postman
Browsing the secured API with the required authentication
Working with token-based authentication
Generating and using tokens
Test your knowledge
Summary
Applying Throttling Rules and Versioning Management Chevron down icon Chevron up icon
Applying Throttling Rules and Versioning Management
Understanding the importance of throttling rules
Learning the purpose of the different throttling classes in the Django REST framework
Configuring throttling policies in the Django REST framework
Running tests to check that throttling policies work as expected
Understanding versioning classes
Configuring a versioning scheme
Running tests to check that versioning works as expected
Test your knowledge
Summary
Automating Tests Chevron down icon Chevron up icon
Automating Tests
Getting ready for unit testing with pytest
Writing unit tests for a RESTful Web Service
Discovering and running unit tests with pytest
Writing new unit tests to improve the tests' code coverage
Running unit tests again with pytest
Test your knowledge
Summary
Solutions Chevron down icon Chevron up icon
Solutions
Chapter 1: Installing the Required Software and Tools
Chapter 2: Working with Models, Migrations, Serialization, and Deserialization
Chapter 3: Creating API Views
Chapter 4: Using Generalized Behavior from the APIView Class
Chapter 5: Understanding and Customizing the Browsable API Feature
Chapter 6: Working with Advanced Relationships and Serialization
Chapter 7: Using Constraints, Filtering, Searching, Ordering, and Pagination
Chapter 8: Securing the API with Authentication and Permissions
Chapter 9: Applying Throttling Rules and Versioning Management
Chapter 10: Automating Tests
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Full star icon Full star icon Full star icon Half star icon Empty star icon 3.1
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4 star 25%
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Vicente Marçal Jun 11, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excelente tratamento apresentando de forma prática como utilizar o Django com Django Rest Framework para a criação de RESTful APIs. Não deve faltar na biblioteca do Desenvolvedor Python/Django.
Amazon Verified review Amazon
Cliente Amazon2 Apr 13, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Utile per capire le API rest su Django rest framework, ovviamente va fatta qualche modifica a livello di codice per fare funzionare il progetto, ma niente di complesso. Consigliato
Amazon Verified review Amazon
Ryan McGuinness Apr 02, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
This is a great book, and a much needed supplement for the online documentation. There are several more advanced topics that are not covered and require a lot of digging. Otherwise a great read with very clear step-by-step instructions.
Amazon Verified review Amazon
Amazon Customer May 15, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Great book with lots of examples. I would definitely recommend it.I would've liked to see a Django project with more than one app. I also would've liked to see a more thorough deployment strategy.
Amazon Verified review Amazon
EG Jun 02, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
The book is a shallow introduction to Django Restful API. The approach the author took is not educational. He put a bunch of code at the beginning of a chapter and devote the rest of the chapter to give poor explanations for the written code. If you have to read this book (unfortunately at the moment there are not many alternatives) I recommend you to get an introduction to APIs from somewhere else. Honestly, simply skip the first 7 chapters of the book and check out the official introduction instead. Last three chapters have some value though.Author loves copy-and-paste. Here is just one example excerpt (out of many) from book:"The PilotCompetitionSerializer class declares a pilot attribute that holds an instance of serializers.SlugRelatedField with its queryset argument set to Pilot.objects.all() and its slug_field argument set to 'name'. We created the pilot field as a models.ForeignKey instance in the Competition model and we want to display the Pilot's name as the description (slug field) for the related Pilot.The PilotCompetitionSerializer class declares a drone attribute that holds an instance of serializers.SlugRelatedField with its queryset argument set to Drone.objects.all() and its slug_field argument set to 'name'. We created the drone field as a models.ForeignKey instance in the Competition model and we want to display the drone's name as the description (slug field) for the related Drone."It is pretty boring to read such a book.
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About the author

Profile icon Gaston C. Hillar
Gaston C. Hillar
Gaston C. Hillar is Italian and has been working with computers since he was 8 years old. Gaston has a Bachelor's degree in computer science (graduated with honors) and an MBA. Currently, Gaston is an independent IT consultant and a freelance author who is always looking for new adventures anywhere in the world. He was a senior contributing editor at Dr. Dobb's, and has written more than a hundred articles on software development topics. He has received the prestigious Intel Black Belt Software Developer award eight times. He has written many articles about Java for Oracle Java Magazine. Gaston was also a former Microsoft MVP in technical computing. He lives with his wife, Vanesa, and his two sons, Kevin and Brandon.
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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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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 [email protected] 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