Testing  in Python
Testing in Python
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Testing  in Python

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Completed on 2020-05-10

About the Book

Getting started with testing can be hard, and this book aims make it all very easy by using examples and explaining the process in a straightforward way. Testing is a core principle of robust software implementations and should be a prime skill to master that can be applied to any project.

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About the Authors

Noah Gift
Noah Gift

Noah Gift lectures at MSDS, at Northwestern, Duke MIDS Graduate Data Science Program, and the Graduate Data Science program at UC Berkeley and the UC Davis Graduate School of Management MSBA program, and UNC Charlotte Data Science Initiative. He is teaching and designing graduate machine learning, A.I., Data Science courses, and consulting on Machine Learning and Cloud Architecture for students and faculty. These responsibilities include leading a multi-cloud certification initiative for students. 

Noah is a Python Software Foundation Fellow.  He currently holds the following industry certifications for AWS:  AWS Subject Matter Expert (SME) on Machine LearningAWS Certified Solutions Architect, and AWS Certified Machine Learning SpecialistAWS Certified Big Data Specialist, AWS Academy Accredited Instructor, AWS Faculty Ambassador.  He also is certified on both the Google and Azure platform: Google Certified Professional Cloud ArchitectCertified Microsoft MTA on Python. He has published over 100 technical publications including multiple books on subjects ranging from Cloud Machine Learning to DevOps. Publications appear in Forbes, IBM, Red Hat, Microsoft, O'Reilly, Pearson, Udacity, Coursera, datascience.com, and DataCamp. Workshops and Talks around the world for organizations including NASA, PayPal, PyCon, Strata, O'Reilly Software Architecture Conference, and FooCamp. As an SME on Machine Learning for AWS, he helped created the AWS Machine Learning certification.

He has worked in roles ranging from CTO, General Manager, Consulting CTO, Consulting Chief Data Scientist, and Cloud Architect. This experience has been with a wide variety of companies: ABC, Caltech, Sony Imageworks, Disney Feature Animation, Weta Digital, AT&T, Turner Studios, and Linden Lab, and industries: Television, Film, Games, SaaS, Sports, Telecommunications. He has film credits in many major motion pictures for technical work, including Avatar, Spider-Man 3, and Superman Returns.

He has been responsible for shipping many new products at multiple companies that generated millions of dollars of revenue and had a global scale. Currently, he is consulting startups and other companies, on Machine Learning, Cloud Architecture, and CTO level consulting as the founder of Pragmatic A.I. Labs.

His most recent books are:

His most recent video courses are:

His most recent online courses are:

You can follow Noah Gift on social media and on the web at:

Alfredo Deza
Alfredo Deza

Alfredo Deza is a passionate software engineer, avid open source developer, Vim plugin author, photographer, and former Olympic athlete. He has given several lectures around the world about Open Source Software, personal development, and professional sports. He has rebuilt company infrastructure, designed shared storage, and replaced complex build systems, always in search of efficient and resilient environments. With a strong belief in testing and documentation, he continues to drive robust development practices wherever he is.

As a spirited knowledge-craving developer Alfredo can be found giving presentations in local groups about Python, file systems and storage, system administration, and professional sports.

His most recent publication is Python For DevOps (O'reilly), and you can follow him on LinkedIn.

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About the Contributors

Alfredo Deza
Alfredo Deza

Alfredo Deza is a passionate software engineer, avid open source developer, Vim plugin author, photographer, and former Olympic athlete. He has given several lectures around the world about Open Source Software, personal development, and professional sports. He has rebuilt company infrastructure, designed shared storage, and replaced complex build systems, always in search of efficient and resilient environments. With a strong belief in testing and documentation, he continues to drive robust development practices wherever he is.

As a spirited knowledge-craving developer Alfredo can be found giving presentations in local groups about Python, file systems and storage, system administration, and professional sports.

His most recent publication is Python For DevOps (O'reilly), and you can follow him on LinkedIn.

Table of Contents

  • Introduction
    • Why test at all?
    • Leveling up from simple scripts to robust implementations
    • Python, Pytest, Tox supported versions in this book
    • About the cover
  • Chapter 1: Configuring the environment
    • Setting up and using Git
    • Setting up and using Virtualenv
    • Installing packages and dependencies
    • Setup Visual Code code
    • Setup and use Vim
    • Setup Makefile
    • Setup and Use ZSH/Bash
    • Using Cloud-based development environments
  • Chapter 2: Testing Conventions
    • Directories
    • Files
    • Functions, Classes, and test methods
    • Special test class methods
    • Good naming patterns
  • Chapter 3: Introduction to Pytest
    • The most simple test possible
    • Why is Pytest important?
    • The power of assert
    • Pytest vs. Unittest
  • Chapter 4: Test Classes
    • Setting up and teardown of xunit-style tests
  • Chapter 5: Reporting
    • PyTest Reporting
    • Code Quality
    • Linting
    • Code Formatting with Python Black
  • Chapter 6: Debugging with Pytest
    • How to debug code
    • Using a debugger
    • Python Debugger (PDB) integration
  • Chapter 7: Pytest fixtures and plugins
    • What are fixtures?
    • Creating new fixtures
    • Built-in Fixtures
    • Advanced Fixture usage
    • Parametrizing
  • Chapter 8: Monkeypatching
    • Why and when to monkeypatch?
    • monkeypatching is hard
    • The simplest monkeypatching
    • Automatic and global monkeypatching
    • Other patching
    • When not to monkeypatch
  • Chapter 9: Testing matrix with Tox
    • Testing different Python versions
    • Expanding the testing matrix
    • Linting and other validations
  • Chapter 10: Continuous Integration and Continuous Delivery
    • What is Continuous Integration and Continuous Delivery and Why Do They Matter?
    • Jenkins
    • CircleCI
    • GCP Cloud Build
    • Continuous Delivery for Hugo Static Site from Zero using AWS Code Pipeline
    • Github Actions
  • Chapter 11: Case Studies and War Stories
    • Testing Click Commandline Tools
    • War Story: The Health Check that wasn’t wrong
    • War Story: The Nine Circles of Hell While Parsing XML
    • War Story: The Mysterious Vanishing Servers
  • Chapter 12: Essays
    • Writing clean, testable, high quality code in Python
    • Increase reliability in data science and machine learning projects with CircleCI
    • Data science project quality

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