今日已更新 281 条资讯 | 累计 21147 条内容
关于我们

标签:#EV

找到 3079 篇相关文章

AI 资讯

I built a $0.0005 screenshot cropper that saves AI agents 95% on vision LLM costs

If you're building AI agents that work with browser screenshots, you already know the pain. You take a full 1920×1080 screenshot, pass it to GPT-4o or Claude, and watch your token bill climb — while the model downscales the image anyway and blurs the exact text you needed it to read. There's a better way. The problem Vision LLMs are expensive for two reasons when you feed them full screenshots: Token cost — a full screenshot can cost 10–20x more tokens than a small crop Accuracy loss — models internally downscale large images, blurring fine text, labels, and UI elements But your agent already knows where to look. Browser automation tools like Playwright and Puppeteer give you getBoundingClientRect() — the exact pixel coordinates of any element on screen. So why are you sending the whole screenshot? The solution I built a stateless pay-per-use API that takes a screenshot and pixel coordinates, and returns just the cropped element as a lossless PNG — ready to pass directly to your vision LLM. POST /crop { "image" : "<base64 screenshot>" , "x" : 120 , "y" : 45 , "width" : 640 , "height" : 80 } Returns: { "success" : true , "data" : { "base64" : "iVBORw0KGgo..." , "mime" : "image/png" , "width" : 640 , "height" : 80 , "bytes" : 4821 } } A 4KB crop instead of a 2MB screenshot. Same information. 95% fewer tokens. How payment works Here's where it gets interesting. The API uses the x402 payment protocol — HTTP's long-dormant 402 Payment Required status code, finally put to use. There are no API keys. No accounts. No subscriptions. The agent pays $0.0005 USDC per crop on Base L2 automatically. The flow: 1. Agent POSTs to /crop (no payment header) ← 402 with payment instructions in headers 2. Agent transfers 0.0005 USDC to recipient wallet on Base (near-zero gas, ~2 second settlement) 3. Agent POSTs again with x-payment-tx-hash header ← 200 with cropped PNG The entire exchange happens inside the HTTP request cycle. No human intervention. No billing dashboard. The money lands

2026-06-25 原文 →
AI 资讯

Building a Real-Time World Cup 2026 Bracket Predictor with Vanilla JS and GitHub Actions

Introduction With the World Cup 2026 group stage reaching its climax, football fans worldwide are speculating about who will make it to the finals. To make this experience interactive, I built a fully dynamic World Cup 2026 Bracket Simulator. Instead of just letting users click and choose winners, this app dynamically calculates ELO win probabilities and probabilistically generates realistic match scores (including extra time and penalties) based on team ratings. It also syncs with live match data in real-time. Live URL: https://worldcup-predict2026.github.io/champion/ Tech Stack: Vanilla JS, CSS3 (3D parallax), GitHub Actions, Python, football-data.org API Core Features & Technical Implementation ELO-Based Win Probability & Score Simulation Each team in the database is assigned an ELO-based strength rating. When a user runs the AI auto-prediction, the script calculates win probability and generates a realistic scoreline. Here is the goal roll algorithm (Poisson-like simulation) implemented in Vanilla JS: javascript function generateMatchScore(team1, team2, winner) { if (team1 === "TBD" || team2 === "TBD" || !winner) return null; const s1 = teamStrengths[team1] || 70; const s2 = teamStrengths[team2] || 70; const winnerIsTeam1 = (winner === team1); const strengthDiff = Math.abs(s1 - s2); const baseGoalExpected = 1.1; const bonusGoal = Math.min(1.8, strengthDiff / 12.0); // Goal weight based on ELO difference const rollGoals = (lambda) => { let L = Math.exp(-lambda); let k = 0; let p = 1.0; do { k++; p *= Math.random(); } while (p > L && k < 10); return k - 1; }; let gWin = 0; let gLose = 0; const r = Math.random(); if (r < 0.75) { // Regular time win (90 mins) gLose = rollGoals(baseGoalExpected); gWin = gLose + 1 + rollGoals(0.7 + bonusGoal); return winnerIsTeam1 ? ${gWin} - ${gLose} : ${gLose} - ${gWin} ; } else if (r < 0.92) { // Extra time win (AET) const normalGoals = rollGoals(baseGoalExpected); gLose = normalGoals; gWin = normalGoals + 1; return winnerIsTeam1 ?

2026-06-25 原文 →
AI 资讯

How Be Recommended by Inithouse Scores AI Visibility 0 to 100 Across ChatGPT, Perplexity, Claude and Gemini

Your product might rank on page one of Google and still be invisible to AI. When someone asks ChatGPT "what's the best project management tool for small teams," does your product show up? For most SaaS companies under 50 employees, the answer is no. At Inithouse, we built Be Recommended to answer that question with a number: a single AI visibility score from 0 to 100 that tells you exactly where you stand across four major AI engines. Here is how the scoring works under the hood. What the score measures The Be Recommended score captures how often, how prominently, and how positively AI engines mention your product when users ask category-relevant questions. A score of 0 means no AI engine mentions you at all. A score of 100 means every tested prompt across all four engines names your product as a top recommendation. The four engines we test against: ChatGPT (OpenAI), Perplexity , Claude (Anthropic), and Gemini (Google). Step 1: Prompt generation We start by building a bank of 50+ real prompts that a potential customer would actually type into an AI assistant. These are not keyword-stuffed test queries. They mirror how real people ask for recommendations. For a CRM product, that looks like: "What CRM should a 10-person startup use?" "Best alternatives to Salesforce for small businesses" "Compare CRM tools with good API integration" "Which CRM has the best free tier in 2026?" We group prompts into three categories: direct (user names the product category), comparative (user asks for alternatives or comparisons), and situational (user describes a problem without naming a category). Each category tests a different signal: brand recognition, competitive positioning, and contextual relevance. Step 2: Multi-engine querying Each prompt gets sent to all four AI engines through their APIs. We capture the full response text, not just a yes/no for whether your product appeared. The raw responses go into a structured analysis pipeline. We run queries from neutral accounts with n

2026-06-25 原文 →
AI 资讯

How to Get Your First Tool Online

TL;DR - A finished app that only runs on one laptop is a private demo. Getting it online means connecting three things: a place to store the code (version control), a place to run it (a host), and an address people can type (a domain). The same AI tool that helped build the app can walk a beginner through all three, often without ever opening a terminal. An important step you don’t want to skip is the security check before going live, because the fastest way to ruin a launch is to ship with the database wide open. So you’ve done it. You built your first tool. And it works. The button does the thing. Now’s the moment. It’s time to get your tool online, but how? A project running on a laptop is real, but it lives in exactly one place, the machine it was built on. Nobody else can open it. Getting that project online is its own small skill, separate from building, and it trips up more beginners than the building did. A new coder can finish a working photo booth app in an afternoon and still have no idea how to hand it to a friend short of pulling up the GitHub link while sitting together over coffee. The good news is that the part that used to eat a whole weekend now takes a conversation. Three Things Every App Needs to Go Live Almost every deployment, whatever the tool, comes down to three things working together. Version control: This is a place to store the code and track every change made to it. For most people that means GitHub, which we’ve talked about before. The same way Google Docs keeps a version history, GitHub keeps one for a project. This piece does not re-explain it; the GitHub walkthrough covers the whole thing. A host: A host is really just a computer that stays powered on and connected to the internet with a public address of its own. When a visitor types in the app's address, their browser sends a request across the internet to that machine, the machine runs the code, and it sends the finished page back. A laptop was quietly doing both jobs during the

2026-06-25 原文 →
AI 资讯

You don't need NextJS: here's why

This is the public, sanitized version of an internal proposal I wrote to move our production app off Next.js. Next.js is the default answer to "I want to build a React app." It's a great framework. But default and necessary aren't the same word. The gap between them quietly cost us speed, debuggability, and a surprising amount of cross-team friction. We were building an authenticated, data-heavy product: dashboards, filters, charts. Almost every screen lived behind a login and updated in response to clicks. For that shape of app, server-side rendering wasn't buying us much, and it was charging us a lot. First, the only question that matters The right architecture depends on what you're building. Content-first: Marketing sites, blogs, storefronts, docs. Mostly public, SEO matters, lots of static content. SSR/SSG is a genuinely great fit. Use Next.js. Seriously. Application-first: Internal tools, dashboards, admin panels, SaaS consoles. Behind auth, highly interactive, bottlenecked by your API and DB — not by React rendering. Put an application-first product on a content-first framework and you pay for machinery you never use. That was us. What SSR actually cost us Production debugging got harder Server-rendered errors don't map cleanly to the components you wrote, so root-causing took longer every single time. Client-side, the error happens in the browser with a stack trace that points at your component. Boring and fast to fix. Server components fought our tests You can't cleanly unit test a server component that renders other server components. Tools like React Testing Library expect renderable elements, not the serialized output a server component produces. We ended up making design choices purely to stay testable. Tail wagging the dog. Authentication became a distributed-systems problem This was a big one. If you gate protected pages on the server, the server must read and validate the token on every request, then propagate auth state through hydration. That singl

2026-06-25 原文 →
AI 资讯

Stop Hand-Designing Open Graph Images: Automate Link Previews for Every Page

Open Graph images are the single biggest factor in whether your shared links look credible or broken. Yet most sites ship one generic image on every page because making a unique one by hand is tedious. Here is a more sustainable approach: treat preview images as generated data, not hand-made design. The problem, concretely When you share a link, the receiving platform reads your page's og:image meta tag and renders a card. If that tag is missing, points to a low-res logo, or is the same image on all 200 pages, your links look generic in every feed, Slack channel, and group chat. Studies of social sharing consistently show that posts with a clear, relevant preview image get meaningfully more engagement than those without. The reason teams skip it is not ignorance. It is friction. Opening a design tool, duplicating a template, swapping the title text, exporting at the right dimensions, and uploading the file takes 10 to 20 minutes per page. Nobody keeps that up across a real publishing schedule. So the back catalog stays bare and new posts get whatever the default is. The insight: it is template work Look at a typical preview card and ask what actually changes between pages. Usually just the title, maybe the author and a category tag. The layout, background, logo, and fonts are constant. That is the textbook definition of a job you should template once and generate programmatically, not redo by hand each time. How to solve it The cleanest pattern is to generate the image at build time or on first request, then cache it. Conceptually: // During your build or in an API route async function getOgImage ( post ) { const params = new URLSearchParams ({ title : post . title , author : post . author , tag : post . category , }); // Returns a ready Open Graph image URL return `https://getcardforge.dev/api/card? ${ params } ` ; } // In your page head // <meta property="og:image" content={getOgImage(post)} /> You can build this yourself with a headless browser plus an HTML templ

2026-06-25 原文 →
AI 资讯

How I built a Minecraft server list that ranks by real player votes (not bots)

Hi, I'm Hugo. I built MinecraftServers-List.com — a Minecraft server directory that ranks servers by genuine player votes and uptime. Why I built it Most existing Minecraft server lists have the same problem: the rankings are easily gamed. Server owners run scripts to inflate their vote counts, and players searching for a good server end up with a list that reflects who has the best bots, not which servers are actually worth playing on. I wanted to fix that. What makes it different Vote integrity — votes are tied to real player sessions and IP validation, making bot voting significantly harder Uptime monitoring — servers that go offline lose ranking visibility automatically Player reviews — verified players can leave reviews with star ratings, giving prospective players real signal Java & Bedrock — both editions listed and filterable by gamemode, version, and country The tech stack Built with TanStack Start (React SSR), Supabase for the database, and deployed on Cloudflare Workers. The SSR approach was important for SEO — server listing pages need to be fully rendered for Googlebot to index individual server pages properly. What I've learned so far Getting a new directory site indexed by Google is genuinely hard. The challenge isn't technical — it's convincing Google that hundreds of server listing pages are individually worth indexing when they all share a similar template structure. The solution has been enriching each server page with structured data (VideoGame schema with AggregateRating), genuine user reviews, and making sure every page has a meaningfully unique meta description generated from real server data — version, gamemode, player count, country. Still a work in progress but the site is live, servers are actively listed, and players are voting daily. Try it If you run a Minecraft server, you can list it free at https://minecraftservers-list.com If you're looking for a server to join, the SMP list and survival list are good starting points. Happy to answe

2026-06-25 原文 →
AI 资讯

Your structured data is probably broken, and your crawler isn't telling you

Most on-page audits catch the obvious stuff: a missing title here, a duplicate meta description there. The thing that quietly costs you rich results is structured data that exists but is invalid, and most flat-list crawlers either skip it or bury it. Here is why it happens and how to catch it. The problem, concretely You add FAQ schema to a product page to win that expandable rich result in Google. You paste a JSON-LD block into the head, ship it, and move on. Six weeks later the rich result never showed up, and nobody knows why. The usual culprits are small and silent: A @type that does not match the content (FAQPage with no mainEntity ). A required property missing ( acceptedAnswer without text ). A trailing comma or a stray character that makes the JSON parse fail entirely. Schema that contradicts what is actually on the page, which Google can flag as spammy and ignore. None of these throw a visible error. The page renders fine. The schema is just dead weight, and a standard "issues" crawl that only counts titles and headings walks right past it. How to catch it First, validate the JSON itself. A block that does not parse is invisible to search engines. Even a quick local check surfaces the dumb-but-fatal errors: // Pull every JSON-LD block and check it parses + has a @type const blocks = [... document . querySelectorAll ( ' script[type="application/ld+json"] ' )]; blocks . forEach (( b , i ) => { try { const data = JSON . parse ( b . textContent ); if ( ! data [ " @type " ]) console . warn ( `Block ${ i } : missing @type` ); } catch ( e ) { console . error ( `Block ${ i } : invalid JSON ->` , e . message ); } }); If that logs an error, the schema was never going to work, no matter how perfect the markup looked. Second, check required properties for the specific type you are using. FAQPage needs mainEntity with Question items, each carrying an acceptedAnswer . Article needs headline , author , and datePublished . Validating "it parsed" is not the same as "it is c

2026-06-25 原文 →
AI 资讯

GuardDuo — The AI Guardian That Keeps Vibe-Coding in Check

AI coding tools are incredible. But I noticed something — they ship code fast, skip the rules, and nobody catches it until it's already in production. That's exactly what GuardDuo is built to fix. The Problem We're in the age of vibe-coding. You describe what you want, the AI builds it, it works — and you ship it. But "works" and "correct" are two very different things. Imagine asking an AI to build a login form. It works perfectly. But under the hood it has hardcoded API keys, no input validation, missing aria-labels , and it's using fetch directly instead of your project's apiClient wrapper. Your Issue said none of that was allowed. Nobody caught it. That's the vibe-coding trap — and it's happening on every team using AI-assisted development right now. What is GuardDuo GuardDuo is a GitLab Duo Agent skill that acts as your AI guardian. Instead of just reviewing code in isolation, it cross-references your code changes against the actual intent of the linked GitLab Issue — using the Orbit Knowledge Graph , which is essentially the brain that knows your project's rules, requirements, and success criteria. In plain terms: GuardDuo reads what the Issue asked for , reads what the code actually does , and tells you exactly where they don't match. It audits across three dimensions: 🔐 Security — hardcoded secrets, SQL injection, missing input validation ♿ Accessibility — missing alt text, aria-labels , poor color contrast 📐 Standards — deviations from your project's established patterns and conventions And when it finds a problem, it doesn't just flag it — it fixes it. How It Works Just open GitLab Duo Chat or GitLab Agent Platform(on your choice of IDE) -> choose the agent as GuardDuo and type: Audit issue #[issue no.] — GuardDuo pulls the Issue context from Orbit, analyzes the code, and returns a structured report Fix issue #[issue no.] — GuardDuo generates a corrected implementation that satisfies all requirements Or paste any code snippet directly and ask it to audit o

2026-06-25 原文 →
AI 资讯

CDK Update - April/May 2026

devtools #infrastructureascode #cdk #aws Index TL;DR Major Features Bedrock AgentCore — From Alpha to Stable Fn::GetStackOutput & Weak Cross-Stack References Validations Framework Performance Improvements CloudWatch PromQL Alarms CLI Improvements New L2 Constructs Service Enhancements Community Highlights Community Content & Resources How Can You Be Involved Hey CDK community! Here's an update covering everything that shipped in April and May 2026. TL;DR Bedrock AgentCore graduated to stable — production-ready AI agent infrastructure with semver guarantees. Cross-region references got a major upgrade with native Fn::GetStackOutput support and weak cross-stack references. The new Validations framework replaces policyValidationBeta1 with a richer plugin system. And file fingerprinting is ~33% faster with persistent asset caching. These features are available in aws-cdk-lib v2.247.0 through v2.257.0 and aws-cdk CLI v2.1116.0 through v2.1125.0. Full changelogs on GitHub Releases ( Library | CLI ). Major Features Bedrock AgentCore — From Alpha to Stable The @aws-cdk/aws-bedrock-agentcore-alpha module has graduated to aws-cdk-lib/aws-bedrockagentcore — stable APIs, semver guarantees, production-ready. If you've been building AI agents with Bedrock but held off on CDK because of the alpha label, it's time to upgrade. ( #37876 ) AgentCore provides the core infrastructure for building AI agents: runtimes, gateways, identity management, observability, and online evaluation. The Policy submodule remains in alpha as it continues to evolve rapidly. ┌─────────────────────────────────────────────────────┐ │ Bedrock AgentCore (Stable) │ ├─────────────────────────────────────────────────────┤ │ │ │ ┌──────────┐ ┌──────────┐ ┌──────────────────┐ │ │ │ Runtime │ │ Gateway │ │ Identity │ │ │ │ (L2) │ │ (L2) │ │ (L2) │ │ │ └────┬─────┘ └────┬─────┘ └────────┬─────────┘ │ │ │ │ │ │ │ ▼ ▼ ▼ │ │ ┌──────────┐ ┌──────────┐ ┌──────────────────┐ │ │ │Observa- │ │Online │ │ Policy Engine │ │ │

2026-06-25 原文 →
AI 资讯

Why API Breaking Changes Still Reach Production Even With CI/CD

Why API Breaking Changes Still Reach Production Even With CI/CD A few years ago I watched a "tiny" API change take down checkout for about forty minutes. The change was a one-liner. The pull request had two approvals. CI was green across the board. And it still broke production, because the thing that actually mattered was never tested. If you run microservices at any real scale, you have lived some version of this. Let's talk about why it keeps happening even with a mature pipeline, and what the teams who don't keep getting paged do differently. The Problem Here's the change that caused the outage. A payments service had a response that looked like this: { "status" : "ok" , "transaction_id" : "txn_8842" , "amount_cents" : 4200 } Someone renamed amount_cents to amount and switched it to a decimal, because "cents is confusing." Cleaner field, better docs. The producing service's tests were updated to match, everything passed, it shipped. The problem: three downstream services still read amount_cents . One of them was the order service, which now received undefined , multiplied it by a quantity, and wrote NaN into the database. The failures didn't even surface in the payments service. They surfaced two hops away, in a service the original author had never opened. This is the core issue. A breaking change is not defined by the service that makes it. It's defined by the consumers who depend on it. And the producer's CI pipeline has no idea those consumers exist. Why Existing Approaches Fail The natural reaction is "we need more tests." But look at what each layer actually checks. Unit tests verify the code does what the author intended. The author intended to rename the field. The unit tests were updated to expect amount . They passed because they were testing the new, broken behavior. Green unit tests told us nothing. Integration tests verify the service works with its own dependencies — its database, its cache, the APIs it calls. They almost never spin up the services

2026-06-25 原文 →
AI 资讯

Omnia Ipsum: Unified placeholder content for Symfony

Rethinking fake content in Symfony projects A prototype web page displaying pure placeholder content When building early UI prototypes or shaping design systems in Symfony, placeholder content becomes a constant companion. Lorem ipsum text. Dummy profile photos. Placeholder videos. Silent audio. Temporary avatars. Realistic fake user data. Every project needs them — and yet most setups rely on a patchwork of libraries, links and hardcoded values. Omnia Ipsum aims to fix that by giving Symfony developers a single, elegant toolkit for placeholder content of all kinds. In this article, I will walk you through the motivation behind the project, the conceptual patterns it follows, and its most advanced features — all designed to make your prototyping workflow faster, cleaner and more maintainable. Motivation: Why a placeholder library? Most Symfony projects start the same way: You add lorem ipsum text manually into Twig templates. You grab placeholder images from an external service. You generate avatars using yet another site. You paste in temporary YouTube or stock video URLs. You install Faker separately whenever realistic data is needed. The result is inconsistent, fragmented and difficult to maintain. And even worse: placeholder content often leaks into production unless guarded carefully. The idea behind Omnia Ipsum was simple: “If your UI needs placeholder content, it should come from one place — predictable, configurable, and accessible directly from Twig.” This cuts down on boilerplate, cognitive overhead, and the "temporary chaos" of early-stage templates. Quick Start Prerequisite Go to github.com/symfinity/recipes and follow the instructions to add the required recipe repository. Installation composer require --dev symfinity/omnia-ipsum Usage Use the Twig functions immediately: <img src= " {{ omnia_image ( 600 , 400 ) }} " alt= "Placeholder" > <img src= " {{ omnia_avatar ( 'John Doe' , 100 ) }} " alt= "Avatar" > <video src= " {{ omnia_video ( 1920 , 1080 ) }}

2026-06-25 原文 →
AI 资讯

Font Manager: Multi-format Font export for Symfony

The Problem Typography should be one of the simplest parts of a project. In reality, it often ends up scattered across multiple layers: Bootstrap: $font-family-base variables Tailwind: JavaScript configuration TypeScript: type definitions Design systems: W3C Design Tokens The same font information gets copied and maintained in several places. Every update means touching multiple files, hoping everything stays in sync. It's repetitive, error-prone, and easy to get wrong. So I built Font Manager. Define your fonts once and export them in whatever format your project needs — CSS, Bootstrap variables, Tailwind configuration, TypeScript definitions, design tokens, and more. The Solution A simple Twig function: {{ font_manager ( 'Ubuntu' , '400 700' ) }} Configuration: symfinity_font_manager : export : formats : - scss_bootstrap - tailwind_config - typescript_definitions One lock command: php bin/console fonts:lock Every format, automatically generated. Perfectly synced. Bootstrap Example Before: // Manually copy font name $font-family-base : 'Ubuntu' , sans-serif ; // ❌ Duplication @import 'bootstrap/scss/bootstrap' ; After: symfinity_font_manager : export : formats : [ scss_bootstrap ] php bin/console fonts:lock // app.scss @import './assets/styles/fonts-bootstrap' ; // ← Auto-generated @import 'bootstrap/scss/bootstrap' ; Bootstrap uses your fonts automatically. No manual mapping. No duplication. Tailwind Example symfinity_font_manager : export : formats : [ tailwind_config ] // tailwind.config.js const fonts = require ( ' ./assets/fonts-tailwind.config.js ' ); // ← Auto-generated module . exports = { theme : { extend : { fontFamily : fonts . fontFamily } } }; <p class= "font-sans" > Your custom font, via Tailwind. </p> TypeScript Example symfinity_font_manager : export : formats : [ typescript_definitions ] import { fonts , type FontFamily } from ' ./assets/fonts ' ; applyFont ( element , ' sans ' ); // ✓ Valid applyFont ( element , ' invalid ' ); // ✗ TypeScript erro

2026-06-25 原文 →
AI 资讯

The New Standard for NPM Package Discovery: Deep Dive into LibPilot

As web developers, engineering workflows are heavily dependent on the NPM registry. However, the traditional process of searching, auditing, and integrating packages remains highly fragmented. Developers are routinely forced to hop between npmjs.com, GitHub source repositories, and external documentation tabs simply to verify bundle sizes, check dependency trees, or generate setup boilerplate. Following a strong reception on LinkedIn, X, and Facebook, the Motion Mind Team has introduced LibPilot to the dev.to community. LibPilot is not a traditional registry interface; it is an AI-powered search engine and discovery hub engineered to index, track, and analyze over 4,000,000 NPM packages in real time. Here is an architectural breakdown of how LibPilot restructures package exploration for modern developers and autonomous AI code agents. Intent-Based Discovery and Global Search Architecture Traditional search engines require users to input the exact name or strict keyword of a library. LibPilot introduces a dual-input architecture on its home page to eliminate this constraint: Direct Registry Querying: Users can input full or partial package names into the global search bar to instantly surface clean, structured, and typed suggestions directly from the live NPM ecosystem database. Contextual AI Recommendations: For scenarios where the ideal package is unknown, developers can type out a complete description of their project architecture or system constraints (for example: "a lightweight, typed state management engine that handles server-side rendering natively"). LibPilot's internal AI agent processes the functional requirements and suggests production-ready libraries suited for that stack. Continuous Context AI and Interactive Onboarding A core goal of the platform is reducing developer friction and maintaining deployment momentum. LibPilot transitions static package documentation into an interactive environment: Unlimited AI Chat Architecture: Once a library is select

2026-06-24 原文 →
AI 资讯

Legacy code não envelhece como vinho: quanto mais espera, pior fica

Semana passada eu passei três horas debugando um bug que deveria levar 20 minutos. O problema? Um módulo de validação escrito em 2019 que ninguém mexe "porque funciona". Spoiler: não funcionava mais, e quando finalmente abri o arquivo, encontrei um // TODO: refactor this datado de 2020. Por que legacy vira bola de neve A indústria trata código legado como se fosse dívida técnica opcional — algo que você paga "quando tiver tempo". Mas código legado se comporta mais como mofo: se espalha, contamina áreas adjacentes, e quanto mais você ignora, mais cara fica a limpeza. O ciclo é previsível: você herda um projeto ou feature antiga, vê que está "meio bagunçado mas roda", adiciona sua feature com um if a mais, e segue em frente. Seis meses depois, outra pessoa faz o mesmo. Um ano depois, aquele arquivo tem 800 linhas, cinco níveis de if aninhados, e zero testes. Ninguém mais entende o fluxo completo, então cada mudança vira uma sessão de especulação: "se eu mexer aqui, quebra ali?" O custo real de esperar Esse código "que funciona" tem um custo oculto que aparece em três formas: Velocidade de desenvolvimento despenca. Features que deveriam levar dois dias levam uma semana porque você passa mais tempo entendendo o contexto do que escrevendo código novo. Bugs aumentam exponencialmente. Código sem testes e com lógica embolada é um gerador de regressões. Você corrige um edge case e quebra outro que nem sabia que existava. Onboarding vira tortura. Novo dev no time? Boa sorte explicando por que aquele service tem três formas diferentes de fazer autenticação, ou por que a mesma validação está copiada em sete lugares. Sinais de que você está sentado em cima de uma bomba Nem todo código antigo é legacy tóxico. Aqui estão os red flags que indicam que você precisa agir agora: // Red flag #1: comentários mentirosos ou inúteis function processPayment ( order ) { // Process the payment const user = order . user ; // TODO: fix this later // HACK: don't touch this, breaks prod if ( user

2026-06-24 原文 →
AI 资讯

How to Fetch Real-Time Options Chain Data in Python (Without Paying $99/mo)

If you've ever tried to pull live options data into a Python script, you've probably hit the same wall I did: the cheapest real-time providers start at $99/mo. Here's how to do it for $20/mo — or free if you stay within 1,000 credits/day. What You'll Need Python 3.8+ requests library ( pip install requests ) An API key from market-option.com (free tier available, no card required) Fetching a Full Options Chain import os import requests API_KEY = os . environ [ " MARKET_OPTIONS_KEY " ] BASE_URL = " https://market-option.com/api/v1 " def get_chain ( ticker : str ) -> list [ dict ]: res = requests . get ( f " { BASE_URL } /options/chain/ { ticker } " , params = { " apiKey " : API_KEY }, ) res . raise_for_status () return res . json ()[ " results " ] contracts = get_chain ( " SPY " ) print ( f " { len ( contracts ) } contracts returned " ) print ( contracts [ 0 ]) Each contract in results looks like this: { "details" : { "contract_type" : "call" , "strike_price" : 530 , "expiration_date" : "2026-01-17" , "ticker" : "O:SPY260117C00530000" }, "last_quote" : { "bid" : 3.45 , "ask" : 3.50 , "midpoint" : 3.475 }, "greeks" : { "delta" : 0.42 , "gamma" : 0.031 , "theta" : -0.18 , "vega" : 0.29 }, "implied_volatility" : 0.182 , "open_interest" : 12418 } Filtering by Expiration and Strike def get_near_the_money ( ticker : str , expiration : str , spot : float , width : float = 0.05 ): """ Return contracts within ±width% of spot price. """ contracts = get_chain ( ticker ) low = spot * ( 1 - width ) high = spot * ( 1 + width ) return [ c for c in contracts if c [ " details " ][ " expiration_date " ] == expiration and low <= c [ " details " ][ " strike_price " ] <= high ] atm = get_near_the_money ( " SPY " , " 2026-01-17 " , spot = 530 ) for c in atm : print ( c [ " details " ][ " strike_price " ], c [ " details " ][ " contract_type " ], c [ " last_quote " ][ " bid " ], c [ " greeks " ][ " delta " ], ) Scanning for High IV Contracts def high_iv_scan ( ticker : str , iv_threshold :

2026-06-24 原文 →