Harry Percival has completed his second book, "Architecture Patterns with Python".
 So of course we talk about the book, also known as "Cosmic Python".
 We also discuss lots of testing topics, especially related to larger systems and systems involving third party interfaces and APIs. Topics Harry's new book, "Architecture Patterns with Python". a.k.a. Cosmic Python TDD : Test Driven DevelopmentTest PyramidTradeoffs of different architectural choicesMocks and their pitfallsAvoiding mocksSeparating conceptual business logicDependency injectionDependency inversionIdentifying external dependenciesInterface adapters to mimize the exposed surface area of external dependenciesLondon School vs Classic/Detroit School of TDDTesting strategies for testing external REST APIsLinks:Cosmic Python - Simple Patterns for Building Complex ApplicationsArchitecture Patterns with Python - on AmazonHarry Percival (@hjwp) / TwitterBob Gregory (@bob_the_mighty) / Twittervcrpy · PyPIWriting tests for external API callsStop Using Mocks (for a while) - Harry's PyCon talk

102: Cosmic Python, TDD, testing and external dependencies  - Harry Percival

Practical automated testing for software engineers using Python.
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I'm starting a SaaS project using Django, and there are tons of decisions right out of the gate. 
To help me navigate these decisions, I've brought on Cory Zue.   
Cory is the creator of SaaS Pegasus, and has tons of experience with Django. Some of the topics discussed:Building Django applicationsSaaS Pegasusplacecard.meWhat boilerplate projects areDjango cookiecutterCookiecutterWhich database to use, probably PostgreSQLAuthentication choises, probably AllauthDocker, Docker for development, Docker for deploymentDeployment targets / hosting services. Render, Heroku, Fly.io, for PaaS options.Front end frameworks. Bootstrap, Tailwind, DaisyUI, TailwindUIHTMX vs React vs straight Django templatesRocketsFont Awesomeand of course, SaaS Pegasus

Sponsored by Mailtrap.ioAn Email Delivery Platform that developers love. An email-sending solution with industry-best analytics, SMTP, and email API, SDKs for major programming languages, and 24/7 human support. Try for Free at MAILTRAP.IOSponsored by PyCharm ProUse code PYTEST for 20% off PyCharm Professional at jetbrains.com/pycharmNow with Full Line Code CompletionSee how easy it is to run pytest from PyCharm at pythontest.com/pycharmThe Complete pytest CourseFor the fastest way to learn pytest, go to courses.pythontest.comWhether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.

219: Building Django Apps & SaaS Pegasus - Cory Zue

Nicole is a software engineer and writer, and recently wrote about the trade-offs we make when deciding which tests to write and how much testing is enough. We talk about:Balancing schedule vs testingHow much testing is the right about of testingShould code coverage be measured and trackedGood refactoring can reduce code coverageIs it worth testing error conditions?Are rare error codes ok to just monitor?API drift and autospecMitigating riskDeciding what to test and what not to testFocus testing on key money-making features If there's a bug in this part of the code, how much business impact is there?Performance testing needs to approximately match real world workloadsCost of a service breaking vs the cost of creating, maintaining, and running testsKeeping test suites quick to minimize getting distracted
 Links:Too much of a good thing: the trade-off we make with tests Load testing is hard, and the tools are... not great. But why?Yet Another Rust Resource (YARR!)Goodhart's law - "When a measure becomes a target, it ceases to be a good measure"

Sponsored by Mailtrap.ioAn Email Delivery Platform that developers love. An email-sending solution with industry-best analytics, SMTP, and email API, SDKs for major programming languages, and 24/7 human support. Try for Free at MAILTRAP.IOSponsored by PyCharm ProUse code PYTEST for 20% off PyCharm Professional at jetbrains.com/pycharmNow with Full Line Code CompletionSee how easy it is to run pytest from PyCharm at pythontest.com/pycharmThe Complete pytest CourseFor the fastest way to learn pytest, go to courses.pythontest.comWhether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.

218: Balancing test coverage with test costs -  Nicole Tietz-Sokolskaya

If you've ever thought about starting a podcast or a SaaS project, you'll want to listen to this episode.
 
Justin is one of the people who motivated me to get started podcasting. 
He's also running a successful SaaS company, transistor.fm, which hosts this podcast. Topics:PodcastingBuilding new SaaS (software as a service) productsBalancing work, side hustle, and familyGreat places to snowboard in British ColumbiaBTW. This episode was recorded last summer before I switched to transistor.fm.
I'm now on Transistor for most of a year now, and I love it. Links from the show:Transistor.fm - excellent podcast hosting, Justin is a co-founderHow to start a podcast in 2024Podcasts from JustinBuild your SaaS - currentBuild & Launch - an older one, but greatMegaMaker - from 2021 / 2022

Sponsored by Mailtrap.ioAn Email Delivery Platform that developers love. An email-sending solution with industry-best analytics, SMTP, and email API, SDKs for major programming languages, and 24/7 human support. Try for Free at MAILTRAP.IOSponsored by PyCharm ProUse code PYTEST for 20% off PyCharm Professional at jetbrains.com/pycharmNow with Full Line Code CompletionSee how easy it is to run pytest from PyCharm at pythontest.com/pycharmThe Complete pytest CourseFor the fastest way to learn pytest, go to courses.pythontest.comWhether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.

217: Podcasting / SaaS / Work Life Balance - Justin Jackson

Charlie Marsh and team are using Rust to make Python tooling faster.Ruff can take the place of Flake8, isort, and Black, and so much more.uv can take the place of pip, pip-tools, and virtualenvAstral is Charlie's venture backed company, and what they have with `ruff` and `uv` is just the start.Since uv is the newest tool, there's quite a bit of the discussion diving into uv. Links:ruffAstraluv

Sponsored by PyCharm ProUse code PYTEST for 20% off PyCharm Professional at jetbrains.com/pycharmFirst 10 to sign up this month get a free month of AI AssistantSee how easy it is to run pytest from PyCharm at pythontest.com/pycharmThe Complete pytest CourseFor the fastest way to learn pytest, go to courses.pythontest.comWhether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.

216: ruff, uv, and Astral: Python tooling, much faster, with Rust

Software engineers that move into leadership roles have a struggle between learning leadership skills, maintaining technical skills, and learning new leadership and technical skills. 
Matt Makai went from individual contributor to developer relations to leadership in devrel. 
We discuss how to stay technical, as well as dive into some results of his studies in how companies use developer relationship channels.

Sponsored by PyCharm ProUse code PYTEST for 20% off PyCharm Professional at jetbrains.com/pycharmFirst 10 to sign up this month get a free month of AI AssistantSee how easy it is to run pytest from PyCharm at pythontest.com/pycharmThe Complete pytest CourseFor the fastest way to learn pytest, go to courses.pythontest.comWhether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.

102: Cosmic Python, TDD, testing and external dependencies - Harry Percival

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