Book Image

Hands-On RESTful Python Web Services - Second Edition

By : Gaston C. Hillar
1 (1)
Book Image

Hands-On RESTful Python Web Services - Second Edition

1 (1)
By: Gaston C. Hillar

Overview of this book

Python is the language of choice for millions of developers worldwide that builds great web services in RESTful architecture. This second edition of Hands-On RESTful Python Web Services will cover the best tools you can use to build engaging web services. This book shows you how to develop RESTful APIs using the most popular Python frameworks and all the necessary stacks with Python, combined with related libraries and tools. You’ll learn to incorporate all new features of Python 3.7, Flask 1.0.2, Django 2.1, Tornado 5.1, and also a new framework, Pyramid. As you advance through the chapters, you will get to grips with each of these frameworks to build various web services, and be shown use cases and best practices covering when to use a particular framework. You’ll then successfully develop RESTful APIs with all frameworks and understand how each framework processes HTTP requests and routes URLs. You’ll also discover best practices for validation, serialization, and deserialization. In the concluding chapters, you will take advantage of specific features available in certain frameworks such as integrated ORMs, built-in authorization and authentication, and work with asynchronous code. At the end of each framework, you will write tests for RESTful APIs and improve code coverage. By the end of the book, you will have gained a deep understanding of the stacks needed to build RESTful web services.
Table of Contents (19 chapters)
Title Page
Dedication
About Packt
Contributors
Preface
Index

Creating a customized permission class for object-level permissions


Create a new Python file named customized_permissions.py within the games_service/games folder and enter the following code that declares the new IsOwnerOrReadOnly class. The code file for the sample is included in the restful_python_2_07_04 folder, in the Django01/games-service/games/customized_permissions.py file:

from rest_framework import permissions 
 
 
class IsOwnerOrReadOnly(permissions.BasePermission): 
    def has_object_permission(self, request, view, obj): 
        if request.method in permissions.SAFE_METHODS: 
            return True 
        else: 
            return obj.owner == request.user 

The rest_framework.permissions.BasePermission class is the base class from which all permission classes should inherit. The previous lines declare the IsOwnerOrReadOnly class as a subclass of the BasePermission superclass and override the has_object_permission method, defined in the superclass, that returns a bool value...