Python Bytes
Python Bytes
Aug 10, 2020
#194 Events and callbacks in the Python language!
29 min

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Brian #1: An introduction to mutation testing in Python

  • Moshe Zadka
  • This article uses mutmut, but there are other mutation testing packages.
  • The example shows 3 methods, and one test case that actually hits 100% code coverage.
  • The mutmut is used and finds 16 surviving mutants.
  • “Mutation testing algorithmically modifies source code and checks if any "mutants" survived each test. Any mutant that survives the unit test is a problem: it means that a modification to the code, likely introducing a bug, was not caught by the standard test suite.”
  • “For each mutation test, mutmut modified portions of your source code that simulates potential bugs. An example of a modification is changing a > comparison to >= to see what happens. If there is no unit test for this boundary condition, this mutation will "survive": this is a potential bug that none of the tests will detect.”
  • Cool example of how to check mission critical parts of your code and the tests around them above and beyond code coverage.
  • BTW, mutmut is also used codechalleng.es in the challenges asking users to write the tests.

Michael #2: asynq

  • From Quora, a little old but still interesting and active
  • A library for asynchronous programming in Python with a focus on batching requests to external services.
  • Also provides seamless interoperability with synchronous code, support for asynchronous context managers, and tools to make writing and testing asynchronous code easier.
  • Developed at Quora and is a core component of Quora's architecture.
  • The most important use case for asynq is batching.
  • asynq's asynchronous functions are implemented as Python generator functions. Every time an asynchronous functions yields one or more Futures, it cedes control the asynq scheduler,

Brian #3: redis: Beyond the Cache

  • Guy Royse
  • Some cool examples with Python code of using redis for more than a cache.
    • as a queue, with rpush and blpop
    • pub/sub, with publish and psubscribe
    • data streaming, with xadd and xread
    • as a search engine
    • and of course, as a primary in-memory database
  • examples use aioredis to access with async/await

Michael #4: LittleTable

  • Discovered as part of my multi-key dictionary quest (more on this later)
  • By Paul McGuire
  • A Python module to give ORM-like access to a collection of objects
  • Provides a low-overhead, schema-less, in-memory database access to a collection of user objects.
  • In addition to basic ORM-style insert/remove/query/delete access to the contents of a Table, littletable offers:
    • simple indexing for improved retrieval performance, and optional enforcing key uniqueness
    • access to objects using indexed attributes
    • simplified joins using '+' operator syntax between annotated Tables
    • the result of any query or join is a new first-class littletable Table

Brian #5: pytest-timeout

  • listener suggestion
  • This is essential, I think.
  • Make sure no test runs longer than a certain number of seconds.
  • You can set a global timeout either via command line or via a config file.
  • You can specify different times for specific tests via a mark decorator
  • Great stopgap to make sure no test runs forever.

Michael #6: Events

  • Call me, maybe
  • by Nicola Iarocci
  • Adds event subscription and callback to the Python language
  • Based on C# language’s events, provides a handy way to declare, subscribe to and fire events.
  • Encapsulates the core to event subscription and event firing and feels like a “natural” part of the language.
  • Example:
    >>> def something_changed(reason):
    ...     print(f"something changed because {reason}")

    >>> from events import Events
    >>> events = Events()
    >>> events.on_change += something_changed
  • Multiple callback functions can subscribe to the same event. When the event is fired, all attached event handlers are invoked in sequence.
    >>> events.on_change('it had to happen')
    'something changed because it had to happen'

Extras:

Michael:

  • Finished the memory management course, coming soon. Started one on Python design patterns

Brian:

Joke:

https://xkcd.com/327/

Kubernetes Podcast from Google
Kubernetes Podcast from Google
Adam Glick and Craig Box
KubeCon NA 2020, with Stephen Augustus
Join us for all the news from KubeCon NA 2020, and a conversation with conference co-chair Stephen Augustus. Stephen is a Senior Open Source Engineer on the VMware Tanzu team, a chair of Kubernetes’ SIG Release, and a leader in many other parts of the project, past and present. Do you have something cool to share? Some questions? Let us know: * web: kubernetespodcast.com * mail: kubernetespodcast@google.com * twitter: @kubernetespod Chatter of the week * The kākāpō wins Bird of the Year * We’re off for 2 weeks. See you on December 8! News of the week * Cisco acquires Banzai Cloud * CNCF announces Cloud Native Survey 2020 results * Red Hat: New edge features, industrial AI/ML blueprint and AWS launch * CNCF End User Tech Radar for storage * New End User benefits * Envoy Mobile joins the CNCF * New sandbox projects * cert-manager * cdk8s * Kyverno * OpenKruise * Pravega * SchemaHero * Tinkerbell * k8ssandra from Datastax * Episode 98 with Sam Ramji * k0s from Mirantis * Solo.io announces Gloo Mesh Enterprise and rebrands products * Episode 55, with Idit Levine * Pinniped * Shipa launches Ketch * Kinvolk launches Headlamp * The SPIFFE book “Solving The Bottom Turtle” * Episode 45, with Andrew Jessup * Anthos Developer Sandbox * GKE ingress features * Ambassador Labs takes in $18m and launches v1.9 * Tanzu SQL: Postgres on Kubernetes * Lightning round: * Accurics extends Terrascan * AWS adds containers to Lightsail * Arrikto takes $10m in funding * Brobridge releases Gravity * CircleCI runner is GA * Cloud66 for agencies and multiple database support * Cloudflare Origin CA cert-manager plugin * Cloudical Vanillastack * Cloudify version 5.1 * Codefresh launches GitOps 2.0 features * Commvault backup-as-a-service * Diamanti Spektra 3.1 and customer portal * Dynatrace PurePath 4 * Elastisys Compliant Kubernetes * The Fairwinds Kubernetes Maturity Model * Garden takes “seed” funding * Gremlin adds soundproofing * Humio Operator * Instana adds observability tools on Kubernetes * Intuit runs TurboTax on Kubernetes * Kioxia announces a new storage offering * Kubecost adds features for monitoring outside a cluster * KubeMQ adds automatic network creation * Kubermatic updates KubeOne to v1.1 * Kubernative SINA * Kublr 1.19 * Lablup announced Backend.ai 20.09 RC * Magalix launches KubeAdvisor 2.0 * Mayadata launches Kubera Propel and Kubera Chaos * Mirantis adds extensions to Lens * Puppet Labs adds Relay to Puppet Enterprise * Reblaze announces Curiefense to add WAF to Envoy * Replicates wants to help you Troubleshoot * Styra adds new editions to DAS * Sysdig introduces Kubernetes-native network security (ZTNSK) and partners with IBM Cloud * TrilioVault for Kubernetes v2.0 * Zerto for Kubernetes * Google Open Source Live Kubernetes Links from the interview * KubeCon NA 2020 * Episode 117, with Constance Caramanolis * CNCF Twitch * SIG Friday: ping Stephen for the current link * Slack * CNCF Slack * Kubernetes Slack * Hallway Track * Kubernetes Podcast chat * CoreOS * CoreOS Tectonic * CoreOS acquired by Red Hat * Tectonic on Azure * SIG Azure * SIG Release * SIG PM (retired) * Kubernetes Enhancement Process * Receipts process KEP * Sidecar containers - KEP closed! * Production readiness review * Episode 10, with Josh Berkus and Tim Pepper * Release managers * Black Lives Matter announcement banner * Better announcements * Kubernetes Naming working group * Inclusive Naming project * Dan Kohn memorial * Stephen Augustus on Twitter and on the web
53 min
Streaming Audio: A Confluent podcast about Apache Kafka
Streaming Audio: A Confluent podcast about Apache Kafka
Confluent, original creators of Apache Kafka®
Multi-Tenancy in Apache Kafka ft. Anna Pozvner
Multi-tenancy has been quite the topic within the Apache Kafka® community. Anna Povzner, an engineer on the Confluent team, spends most of her time working on multi-tenancy in Kafka in Confluent Cloud. Anna kicks off the conversation with Tim Berglund (Senior Director of Developer Experience, Confluent) by explaining what multi-tenancy is, why it is worthy to be desired, and advantages over single-tenant architecture. By putting more applications and use cases on the same Kafka cluster instead of having a separate Kafka cluster for each individual application and use case, multi-tenancy helps minimize the costs of physical machines and also maintenance. She then switches gears to discuss quotas in Kafka. Quotas are essentially limits—you must set quotas for every tenant (or set up defaults) in Kafka. Anna says it’s always best to start with bandwidth quotas because they’re better understood. Stick around until the end as Anna gives us a sneak peek on what’s ahead for multi-tenant Kafka, including KIP-612, the addition of the connection rate quota, which will help protect brokers. EPISODE LINKS * Sharing is Caring: Toward Creating Self-Tuning Multi-Tenant Kafka (Anna Povzner, Confluent) Join the Confluent Community Slack * Learn more with Kafka tutorials, resources, and guides at Confluent Developer * Live demo: Kafka streaming in 10 minutes on Confluent Cloud * Use *60PDCAST* to get an additional $60 of free Confluent Cloud usage (details)
44 min
Software Defined Talk
Software Defined Talk
Software Defined Talk LLC
Episode 272: This time we’re doing it in green
This week we discuss IBM buying Instana, highlights from Kubecon and the rise of Substack. Plus, Coté updates us on his quest to live the iPad lifestyle. The Rundown IBM To Acquire Instana For Undisclosed Terms (https://www.nasdaq.com/articles/ibm-to-acquire-instana-for-undisclosed-terms-quick-facts-2020-11-18) Instana Crunch Base Overview (https://www.crunchbase.com/organization/instana) KubeCon Review Envoy Mobile Joins the CNCF (https://medium.com/@mike.schore/99aee4bdb32e) Open Source Web Engine Servo to be Hosted at Linux Foundation - The Linux Foundation (https://www.linuxfoundation.org/press-release/2020/11/open-source-web-engine-servo-to-be-hosted-at-linux-foundation/) Relevant to your Interests The Evolution of Cloud (https://greylock.com/jerry-chen-the-evolution-of-cloud/) 2020 State of DevOps Report | presented by Puppet, & CircleCi (https://puppet.com/resources/report/2020-state-of-devops-report/?mkt_tok=eyJpIjoiWldSbVpUbGtaVEZtWVRFMiIsInQiOiJhYWtBcEcxQ3Z2TitXcCtkbXJDZTBIbVcrb25qMEtTR1VvWXZNaDV2QmZEXC96ekJxZGxIRmxcL0JwaHdjN1FVYWMrUm9rRG8rYTE3QmozRlo4QU9IdFhvRWt3WUNvdDVvZWJSVmpLaFEzZnhNMllocGZNZUlUS0RmcVwvTDVZSEh3RSJ9) Amazon's Inferentia AI Chip Is Ready For Prime Time, Now Powers the Alexa Service (https://www.fool.com/investing/2020/11/12/amazons-inferentia-ai-chip-is-ready-for-prime-time/) FinOps Foundation launches Kubernetes Whitepaper with CNCF, adds vendor members, Densify, SoftwareOne, Virtasant and more... 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Start your free 14-day trial today at: strongdm.com/SDT (http://strongdm.com/SDT) Teleport provides consolidated access to all computing resources such as servers, Kubernetes clusters or internal applications across all environments. Watch a demo, download the free version, or sign up for cloud at goteleport.com (https://goteleport.com/) Listener Feedback Little Snitch (http://Little Snitch 4) from Jordy Mac users couldn’t launch apps this afternoon after Apple verification server issue (https://www.theverge.com/2020/11/12/21563092/apple-mac-apps-load-slow-big-sur-downloads-outage-down-issues) Conferences Mykel Alvis All Day DevOps Talk (https://youtu.be/cttjekzVEqU?t=1945) SDT news & hype Join us in Slack (http://www.softwaredefinedtalk.com/slack). Send your postal address to stickers@softwaredefinedtalk.com (mailto:stickers@softwaredefinedtalk.com) and we will send you free laptop stickers! 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Brandon: The Undoing (https://www.hbo.com/the-undoing?camp=GOOGLE%7cHTS_SEM%7cPID_p56310902692&keyword=the+undoing+hbo+show&utm_id=sa%7c71700000070858786%7c58700006239587173%7cp56310902692&utm_content=tun&gclid=Cj0KCQiA48j9BRC-ARIsAMQu3WSxjOpeoiBA6i3bBzeC-IL0JpPrwhoPrBOmtfTcNA37YokcAcnFo54aAtPnEALw_wcB&gclsrc=aw.ds) on HBO (https://www.hbo.com/the-undoing?camp=GOOGLE%7cHTS_SEM%7cPID_p56310902692&keyword=the+undoing+hbo+show&utm_id=sa%7c71700000070858786%7c58700006239587173%7cp56310902692&utm_content=tun&gclid=Cj0KCQiA48j9BRC-ARIsAMQu3WSxjOpeoiBA6i3bBzeC-IL0JpPrwhoPrBOmtfTcNA37YokcAcnFo54aAtPnEALw_wcB&gclsrc=aw.ds) and Serverless Data APIs (https://www.thecloudcast.net/2020/11/serverless-data-apis.html) from the Cloudcast Coté: Dithering (https://dithering.fm/)) podcast (https://dithering.fm/)) (https://dithering.fm/ (https://dithering.fm/)); Ted Laso. (https://tv.apple.com/show/umc.cmc.vtoh0mn0xn7t3c643xqonfzy?itscg=MC_20000&itsct=atvp_brand_omd&mttn3pid=a_google_adwords&mttnagencyid=1625&mttncc=US&mttnsiteid=143238&mttnsubad=OUS2019863_1-469980364686-c&mttnsubkw=106182847425_kwd-937070194980_rdMG7cVq_&mttnsubplmnt=) Photo Credit from Red Hat Container Coloring Book (https://developers.redhat.com/books/container-coloring-book-whos-afraid-big-bad-wolf) Photo Credit (https://unsplash.com/photos/wBzam0EPbXU)
1 hr 5 min
Azure DevOps Podcast
Azure DevOps Podcast
Jeffrey Palermo
Scott Nichols on the State of Azure - Part 2 - Episode 116
This episode is part 2 of the interview with Scott Nichols! Be sure to tune in to part 1 first before joining in on this episode’s conversation. Scott Nichols is a Sr. Cloud Solutions Architect, Scott works for the commercial enterprise division serving the west region. He is also the leader of the .NET and the Azure user groups in Boise, Idaho. He started his career in the IT profession in 1993 as a mainframe and web developer. Since then, he has served as a Lead Software Engineer/Solution Architect, a Software Development Engineering Manager, a Sr. Cloud Software Solution Architect, a Sr. Enterprise Solution Architect, and of course, most recently, a Sr. Cloud Solutions Architect at Microsoft since 2019. In this second part, the interview transitions from discussing the state of Azure and the Cloud industry into talking about how customers are modernizing their existing applications and infrastructure for Azure. Scott shares about infrastructure as code tools he sees as having the most traction right now, his recommendations for those looking to get their application into Azure, and what he sees as being the most successful pathways for his customers utilizing Azure infrastructure. Topics of Discussion: [:38] Be sure to visit AzureDevOps.Show for past episodes and show notes. [1:01] About The Azure DevOps Podcast and Jeffrey’s offer to speak at virtual user groups. [1:11] Clear Measure is hiring! Be sure to check out the link in the show notes. [1:33] Jeffrey welcomes Scott back to the podcast for part 2 and shares about this episode’s conversation. [2:06] The infrastructure as code tools Scott sees as having the most traction. [4:35] Does Scott have any customers that have used Azure Bicep yet? [4:56] How Scott thinks about Azure infrastructure and what he sees as being most successful with his customers. [7:42] For certain tweaks in the infrastructure, where does an ARM template work? [9:45] What is the mechanism in Azure that would know that the Powershell script has not been run yet or has already been run so that it doesn’t run it again? [11:07] A word from Azure DevOps Podcast’s sponsor: Clear Measure. [11:38] For people looking to get their application into Azure, what would Scott recommend their next steps be? [20:37] Jeffrey thanks Scott for joining the podcast and Scott offers some parting words of advice for developers. Mentioned in this Episode: Azure DevOps Clear Measure (Sponsor) .NET DevOps for Azure: A Developer's Guide to DevOps Architecture the Right Way, by Jeffrey Palermo — Available on Amazon! bit.ly/dotnetdevopsebook — Click here to download the .NET DevOps for Azure ebook! Jeffrey Palermo’s Youtube Jeffrey Palermo’s Twitter — Follow to stay informed about future events! The Azure DevOps Podcast’s Twitter: @AzureDevOpsShow Scott Nichols’ LinkedIn Scott Nichols’ Twitter @TheScottNichols Azure Architecture Center - Microsoft Amazon Web Services (AWS) Azure Architectures - Microsoft Docs Google Cloud (GCP) Microsoft Cloud Adoption Framework (CAF) Azure Bicep on GitHub .NET Conference 2020 Python Terraform Azure Resource Manager (ARM) CICD PowerShell HashiCorp Want to Learn More? Visit AzureDevOps.Show for show notes and additional episodes.
23 min
The Cloudcast
The Cloudcast
Cloudcast Media
eBPF & Cilium Cloud-native Networking
Dan Wendlandt (@danwendlandt, CEO/Co-Founder @Isovalent talks about the evolution of cloud networking, eBPF and Cilium for programmable infrastructure, and blurring the lines between networking, security and service-mesh.  *SHOW: *476 *SHOW SPONSOR LINKS:* * CloudAcademy -Build hands-on technical skills. Get measurable results.  * Get 50% of the monthly price of CloudAcademy by using code CLOUDCAST * Datadog Security Monitoring Homepage - Modern Monitoring and Analytics * Try Datadog yourself by starting a free, 14-day trial today. Listeners of this podcast will also receive a free Datadog T-shirt. * Learn more about Fauna: https://www.fauna.com/serverless * Try FaunaDB for Free: https://dashboard.fauna.com/accounts/register *CLOUD NEWS OF THE WEEK *- http://bit.ly/cloudcast-cnotw *PodCTL Podcast is Back (Enterprise Kubernetes) *- http://podctl.com *SHOW NOTES:* * Isovalent (homepage) * Cilium (homepage) * What is eBPF?  *Topic 1 *- Welcome to the show. We’ve been following your work for a while (Nicira, OpenShift networking, etc), but tell our audience a little bit about your background. *Topic 2* - A few years ago I wrote an article that said, “if you’re in networking, the #1 skill you should learn is Linux”. Why has there been so much shift from “traditional networking” to so many new capabilities being implemented in software, and specifically Linux? *Topic 3 *- Help us understand these two new concepts - eBPF and Cilium. It’s new packet filtering, it’s container networking, it’s multi-cluster networking, it can help with observability - lots going on here.  *Topic 4 *- What are some of the gaps in today’s networking/filtering/observability stacks that can improve with eBPF/Cilium?*   * *Topic 5 *- We’ve seen quite a few companies evolve from expertise in an open-source project to commercial offerings. What lessons have you learned from other companies that shape how Isovalent will both go-to-market and also engage with ecosystem partners?* * *Topic 6 *- What are some of the common use-cases or applications you see that highlight the value of the Isovalent stack?  *FEEDBACK?* * Email: show at thecloudcast dot net * Twitter: @thecloudcastnet
36 min
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