List of videos

"Leveraging consistent hashing in your python applications [EuroPython 2017 - Talk - 2017-07-11 - Anfiteatro 2] [Rimini, Italy] While consistent hashing is largely known and adopted in the NoSQL database clusters to solve data distribution and data access reliability, it is less known and used by the typical developers. This talk will introduce you to consistent hashing and the problems it solves while going through a practical use case in a python application. We will start from its standalone design and scale it out to an optimized clustered version thanks to consistent hashing. License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"Tracing, Fast and Slow: Digging into & improving your web service’s performance [EuroPython 2017 - Talk - 2017-07-11 - Anfiteatro 1] [Rimini, Italy] Do you maintain a Rube Goldberg like service? https://s-media-cache-ak0.pinimg.com/564x/92/27/a6/9227a66f6028bd19d418c4fb3a55b379.jpg Perhaps it’s highly distributed? Or you recently walked onto a team with an unfamiliar codebase? Have you noticed your service responds slower than molasses? This talk will walk you through how to pinpoint bottlenecks, approaches and tools to make improvements, and make you seem like the hero! All in a day’s work. The talk will describe various types of tracing a web service, including black & white box tracing, tracing distributed systems, as well as various tools and external services available to measure performance. I’ll also present a few different rabbit holes to dive into when trying to improve your service’s performance. License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"How Facebook uses Python to build (and operate) datacenters at scale [EuroPython 2017 - Talk - 2017-07-11 - Anfiteatro 1] [Rimini, Italy] With 4 datacenters on-line and more coming fast, building and operating datacenter buildings becomes a problem we need to solve at scale. At Facebook, Several teams of Production Engineers write the software that helps us do this efficiently, and we use Python... a lot. In this talk, I will go into some detail about only some of problems we try to solve to make sure our datacenters come online on time so that we can make sure you can connect with all your friends on Facebook, and keep them humming, as efficiently as possible. We'll go into some detail about the awesome Python infrastructure (some of it open source), that we use to build this software, and some of the engineering practices. This is a talk for you if you were wondering how to track each and every strand of fiber cabling within a datacenter, or make sure we find out that the cooling system isn't really doing it's thing before actual servers catch fire from serving you live videos. License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"Abstract Base Classes: a smart use of metaclasses [EuroPython 2017 - Talk - 2017-07-11 - PythonAnywhere Room] [Rimini, Italy] This talk shows what Python Abstract Base Classes (ABCs) are and how they can be used to categorise objects and implement a virtual inheritance tree. The goal of the talk is to introduce programmers to the concept of ABCs, and to show that metaclasses are not a terribly complex topic, but something that can be used by normal programmers. The talk is divided in three different “levels of difficulty”, each of one going deeper in the technical aspects of the subject. Level 1: Polymorphism - Behaviours and delegation - Collections The first level is meant to give a quick overview of the collections package and some useful code snippets. Even beginners can benefit of the information given here. To complete this level you only need to know what a try/except block is. Level 2: Registering - Abstract Base Classes - Categories The second level shows what real and virtual inheritance are, explains what is the meaning of registering and defines Abstract Base Classes. To complete this level you need to know what class inheritance is (i.e. what class MyList(list) means). Level 3: Build your ABCs - Metaclasses - ABSs as interfaces The third level shows how to create your own ABCs, why metaclasses are involved and why they are not a difficult concept. I will then quickly review a possible use of metaclasses as interfaces. To complete this level you need to know how to instantiate a class, and the difference between class and instance. License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"Serverless Applications with Chalice [EuroPython 2017 - Talk - 2017-07-11 - PythonAnywhere Room] [Rimini, Italy] Serverless computing: it is the practice of building and running services and applications without having to worry about provisioning and managing servers. Serverless computing has been a popular topic the past couple years, and with respect to Python, there have been various different frameworks and tools released for developing and managing your Python serverless applications. This talk will focus on developing and managing your serverless applications with chalice (https://github.com/awslabs/chalice), a python serverless microframework for AWS. Discussion points for this talk will include, but not be limited to: • Overview of serverless applications • Best practices in writing a serverless application • Basic usage and core features of chalice • Writing complete, production-level applications using chalice • Managing and maintaining serverless applications using chalice tooling By the end of the talk, audience members should have a better understanding of serverless computing and how to use chalice to develop and maintain serverless applications. License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"Django: From a nightmare to a dream with Best Practices. [EuroPython 2017 - Talk - 2017-07-11 - Anfiteatro 1] [Rimini, Italy] With the adventure in the source code of the site of EuroPython, we have detected that the code was difficult to maintain. With the members of the Web team, we have started to refactor the code with the best practices and good concept. Also, we will see some awesome libraries for the Django project. In brief, you have a legacy code and you want to improve it with best practices, then this talk is for you. You don't want to break it but you don't want to change it because you can break it at all times, we will show you how to improve an existing code with some tools and best practices, and your code can be deploy on Friday evening with no risk. From a nightmare to a dream. Keywords, TDD, Refactoring, Tests, BDD, Selenium, CI, and many more... License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"Using the right Async tool, present day [EuroPython 2017 - Talk - 2017-07-11 - Arengo] [Rimini, Italy] Recent releases like AsyncIO and Django Channels gave a new push towards building real-time web-apps fast and easy. However, as similar tools exist in Python since 2000th, how should we balance between modern and time-proven? This talk includes but is not focused just on AsyncIO. It gives an overview of Async libraries in Python, and helps with choosing a right tool for various web tasks. It describes caveats of using Twisted, Tornado and AsyncIO including theory and live code, and concludes with a basic overview of Django Channels. Talk plan Why do we need Async Web (5 min) Existing libraries and frameworks: Twisted, Tornado, AsyncIO (15 min) Sample task, sample code, conclusions (10 min) (optional) what's about Django Channels? Q & A (5 min) License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"OpenAPI development with Python [EuroPython 2017 - Talk - 2017-07-11 - PythonAnywhere Room] [Rimini, Italy] Goal After this session, audiences will get - Basic knowledge of OpenAPI (Swagger) - Ecosystem of OpenAPI(Swagger) and tools related to Python and knowledge to make use of them in their own projects Audience (1) This talk is for: - Developers who are creating or using API services such as web applications, mobile applications and all other kinds of applications (2) Audience will be expected to have (prerequisite): - Basic knowledge of development with API (REST and others) - Basic knowledge of Python Outline Introduction (3min) Agenda of this talk Myself introduction OpenAPI(Swagger) introduction and basics (8min) What is OpenAPI and what is the relation with Swagger? (5min) Comparison with other frameworks for APIs (3min) api blueprint, json schema and .. OpenAPI ecosystem and tools (8min) OpenAPI(Swagger) core tools (4min) Swagger editor, Swagger codegen and Swagger UI OpenAPI tools related to Python (4min) Some tools for python api development with OpenAPI Actual case study with OpenAPI and Python (8min) Introduce our projects with OpenAPI, Python and other program (like Angular, Typescript and so on) and explain how swagger is well working in our company Recap and Conclusion (2min) License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/

"Write more decorators (and fewer classes) [EuroPython 2017 - Talk - 2017-07-11 - Anfiteatro 2] [Rimini, Italy] In the wake of famous talk “Stop Writing Classes” by Jack Diederich (https://www.youtube.com/watch?v=o9pEzgHorH0), I’d like to present a pattern that can be used to design clean and pythonic interfaces for programmers based on replacing single-method classes with decorated functions. This pattern is already used by some famous frameworks and libraries, like Pyramid (https://trypyramid.com/), but I believe it isn’t that well-known to many (even experienced) Python developers and is not as widely used as it deserves. I’ll show how this pattern can be employed to improve a programming interface which is used by an internal log processing framework at Yelp. This will demonstrate how a more functional approach, leveraging the power of Python decorators, can lead to simpler, more beautiful and easier to understand code. However, this talk doesn’t suggest giving up classes altogether, but making use of them only when they are truly useful. In fact, the use-case I’m going to analyze will combine classes, functions, and decorators to make the best out of these tools. Given that the presentation is going to be very code-oriented, the talk is intended for an audience of developers who are already familiar with most Python constructs, including decorators, even though the concept will be briefly introduced at the beginning of the talk. But, if you are one of these people, I promise you that the code will speak for itself. License: This video is licensed under the CC BY-NC-SA 3.0 license: https://creativecommons.org/licenses/by-nc-sa/3.0/ Please see our speaker release agreement for details: https://ep2017.europython.eu/en/speaker-release-agreement/