«Scrapy internals» Александр Сибиряков, Scrapinghubit-people- Scrapy is a framework for web scraping that allows for extraction of structured data from HTML/XML through selectors like CSS and XPath. It provides features like an interactive shell, feed exports, encoding support, and more.
- Scrapy is built on top of the Twisted asynchronous networking framework, which provides an event loop and deferreds. It handles protocols and transports like TCP, HTTP, and more across platforms.
- Scrapy architecture includes components like the downloader, scraper, and item pipelines that communicate internally. Flow control is needed between these to limit memory usage and scheduling through techniques like concurrent item limits, memory limits, and delays between calls.
«Отладка в Python 3.6: Быстрее, Выше, Сильнее» Елизавета Шашкова, JetBrainsit-peopleThe document discusses debugging in Python 3.6. It describes tracing and frame evaluation debuggers. Tracing debuggers slow code execution significantly by calling the tracing function on every line. Python 3.6 introduced a new frame evaluation API that allows evaluating frames directly, avoiding the performance issues of tracing. The document demonstrates how to build a debugger using this approach, including setting breakpoints and stepping through code by inserting temporary breakpoints on each line. Frame evaluation allows building a debugger that is faster than tracing debuggers without significant performance penalties.
«Gevent — быть или не быть?» Александр Мокров, Positive Technologiesit-peopleGevent is a concurrency library for Python that uses greenlets, or lightweight coroutines, to provide asynchronous operations and non-blocking I/O. It allows developing highly concurrent applications using a simple and familiar synchronous style. The document compares gevent to other concurrency options like asyncio and discusses how it provides features like asynchronous task execution, event loops, and inter-greenlet communication using queues and callbacks.
«Что такое serverless-архитектура и как с ней жить?» Николай Марков, Aligned ...it-peopleThe document discusses what serverless computing is and how it can be used for building applications. Serverless applications rely on third party services to manage server infrastructure and are event-triggered. Popular serverless frameworks like AWS Lambda, Google Cloud Functions, Microsoft Azure Functions, and Zappa allow developers to write code that runs in a serverless environment and handle events and triggers without having to manage servers.
«Python на острие бритвы: PyPy project» Александр Кошкин, Positive Technologiesit-peopleThe document describes a talk on optimizing Python performance through just-in-time compilation. It discusses how the CPython interpreter works by evaluating bytecode through an evaluation loop. It then talks about how PyPy achieves faster performance through jit compilation of hot loops detected via tracing. The talk dives into the RPython language used to implement PyPy and shows an example of compiling a small Python program to C with RPython. It also discusses using partial evaluation to specialize an interpreter for constant inputs.
«PyWat. А хорошо ли вы знаете Python?» Александр Швец, Marilyn Systemit-peopleThe document appears to be a transcript of Python code being executed in an interactive Python shell. It contains examples testing the behavior of built-in functions and operators like sorted(), reversed(), isinstance(), sum(), float("nan"), is, min(), and comparisons like ==, <, on various data types including lists, tuples, and dictionaries.
«(Без)опасный Python», Иван Цыганов, Positive Technologiesit-peopleThe document discusses various security vulnerabilities in Python web applications. It begins with an overview of the OWASP Top 10 security risks, with sections focusing on risks related to using components with known vulnerabilities (A9) and insufficient attack protection (A7). For A9, it provides examples of vulnerabilities in popular Python packages and recommends checking changelogs and vulnerability databases. For A7, it recommends implementing attack protections like login attempts logging, rate limiting, and use of a web application firewall. The document also covers security misconfiguration (A5), giving examples like using default settings in production and exposing tracebacks.
«Как сделать так, чтобы тесты на Swift не причиняли боль» Сычев Александр, Ra...it-peopleThe document discusses best practices for writing tests in Swift, including recommendations to:
- Write clean, readable tests that focus on asserting a single truth
- Use a domain-specific language in tests for clarity
- Structure tests with "given-when-then"
- Mock dependencies through protocols to enable test isolation
- Favor partial mocks over fully mocking to limit complexity
"How to Build an Innovation pipeline in Large Organizations" Atzmon Tal, Inno...it-peopleThis document outlines how to build an innovation funnel in large organizations. It discusses challenges like stifling innovation and looking for shortcuts. It then presents HPE Software's innovation funnel model as a case study. The model includes four stages - ideation, incubation, seed, and growth. Ideas are submitted and refined through each stage, which involves validating problems/solutions, building MVPs, and handing projects off to businesses. Metrics are used to manage the funnel. The results for HPE show over 600 ideas submitted, 110 incubated, 18 seeded, and 11 grown into projects over two years. It concludes that organizations should start by validating a use case to reduce innovation risks.
«Что такое serverless-архитектура и как с ней жить?» Николай Марков, Aligned ...it-peopleThe document discusses what serverless computing is and how it can be used for building applications. Serverless applications rely on third party services to manage server infrastructure and are event-triggered. Popular serverless frameworks like AWS Lambda, Google Cloud Functions, Microsoft Azure Functions, and Zappa allow developers to write code that runs in a serverless environment and handle events and triggers without having to manage servers.
«Python на острие бритвы: PyPy project» Александр Кошкин, Positive Technologiesit-peopleThe document describes a talk on optimizing Python performance through just-in-time compilation. It discusses how the CPython interpreter works by evaluating bytecode through an evaluation loop. It then talks about how PyPy achieves faster performance through jit compilation of hot loops detected via tracing. The talk dives into the RPython language used to implement PyPy and shows an example of compiling a small Python program to C with RPython. It also discusses using partial evaluation to specialize an interpreter for constant inputs.
«PyWat. А хорошо ли вы знаете Python?» Александр Швец, Marilyn Systemit-peopleThe document appears to be a transcript of Python code being executed in an interactive Python shell. It contains examples testing the behavior of built-in functions and operators like sorted(), reversed(), isinstance(), sum(), float("nan"), is, min(), and comparisons like ==, <, on various data types including lists, tuples, and dictionaries.
«(Без)опасный Python», Иван Цыганов, Positive Technologiesit-peopleThe document discusses various security vulnerabilities in Python web applications. It begins with an overview of the OWASP Top 10 security risks, with sections focusing on risks related to using components with known vulnerabilities (A9) and insufficient attack protection (A7). For A9, it provides examples of vulnerabilities in popular Python packages and recommends checking changelogs and vulnerability databases. For A7, it recommends implementing attack protections like login attempts logging, rate limiting, and use of a web application firewall. The document also covers security misconfiguration (A5), giving examples like using default settings in production and exposing tracebacks.
«Как сделать так, чтобы тесты на Swift не причиняли боль» Сычев Александр, Ra...it-peopleThe document discusses best practices for writing tests in Swift, including recommendations to:
- Write clean, readable tests that focus on asserting a single truth
- Use a domain-specific language in tests for clarity
- Structure tests with "given-when-then"
- Mock dependencies through protocols to enable test isolation
- Favor partial mocks over fully mocking to limit complexity
"How to Build an Innovation pipeline in Large Organizations" Atzmon Tal, Inno...it-peopleThis document outlines how to build an innovation funnel in large organizations. It discusses challenges like stifling innovation and looking for shortcuts. It then presents HPE Software's innovation funnel model as a case study. The model includes four stages - ideation, incubation, seed, and growth. Ideas are submitted and refined through each stage, which involves validating problems/solutions, building MVPs, and handing projects off to businesses. Metrics are used to manage the funnel. The results for HPE show over 600 ideas submitted, 110 incubated, 18 seeded, and 11 grown into projects over two years. It concludes that organizations should start by validating a use case to reduce innovation risks.
