--- title: "#datascience articles | Hashnode" description: "Explore 190 articles tagged #datascience on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/datascience" --- Tag # #datascience 190 posts · 29 followers [Ositrustees](https://hashnode.com/@Ositrustees) · [2d ago](https://hashnode.com/posts/ositrustees-building-a-market-data-validation-pipeline-in-python/6af1efbbd1b5bafd10bcc803) ### [Ositrustees: Building a Market Data Validation Pipeline in Python](https://ositrustees.hashnode.dev/ositrustees-building-a-market-data-validation-pipeline-in-python?utm_source=hashnode&utm_medium=feed) Explore how Ositrustees research principles relate to Python market data validation, timestamp checks, duplicate detection and financial analytics. Copy 12 min read · [ositrustees.hashnode.dev](https://ositrustees.hashnode.dev/ositrustees-building-a-market-data-validation-pipeline-in-python?utm_source=hashnode&utm_medium=feed) [anders lee](https://hashnode.com/@anderslee) · [2d ago](https://hashnode.com/posts/what-i-learned-turning-government-property-tax-spreadsheets-into-one-county-dataset/6af10e4abbb9c0510c27c224) ### [What I learned turning government property tax spreadsheets into one county dataset](https://anders.hashnode.dev/what-i-learned-turning-government-property-tax-spreadsheets-into-one-county-dataset?utm_source=hashnode&utm_medium=feed) I wanted a simple answer to a simple question: how much property tax does a typical homeowner pay in each U.S. county, and what are the actual local rates behind it? The data exists, but it's spread a 5 min read · [anders.hashnode.dev](https://anders.hashnode.dev/what-i-learned-turning-government-property-tax-spreadsheets-into-one-county-dataset?utm_source=hashnode&utm_medium=feed) [Doogal Simpson](https://hashnode.com/@doogal) · [6d ago](https://hashnode.com/posts/why-python-rounds-2-5-to-2/6aec4d389f5d7fbe87cc5488) ### [Why Python Rounds 2.5 to 2: Banker's Rounding Explained](https://doogal.dev/why-python-rounds-2-5-to-2?utm_source=hashnode&utm_medium=feed) Understand why Python's round(2.5) evaluates to 2, how banker's rounding eliminates statistical bias, and how to implement traditional round-half-up logic. 4 min read · [doogal.dev](https://doogal.dev/why-python-rounds-2-5-to-2?utm_source=hashnode&utm_medium=feed) [4](https://hashnode.com/posts/why-python-rounds-2-5-to-2/6aec4d389f5d7fbe87cc5488) [Fjord Labs](https://hashnode.com/@fjordlabs) · [Nov 3](https://hashnode.com/posts/track-what-s-trending-on-google-in-20-countries-with-15-lines-of-python/6ae9e8d63685c1131ab1579f) ### [Track what's trending on Google in 20 countries with 15 lines of Python](https://fjordlabs.hashnode.dev/track-what-s-trending-on-google-in-20-countries-with-15-lines-of-python?utm_source=hashnode&utm_medium=feed) Google Trends has a page called Trending Now: the searches that are spiking right now in a given country, with a rough search volume and the news… 2 min read · [fjordlabs.hashnode.dev](https://fjordlabs.hashnode.dev/track-what-s-trending-on-google-in-20-countries-with-15-lines-of-python?utm_source=hashnode&utm_medium=feed) [Pounce Za](https://hashnode.com/@pounceza) · [Nov 1](https://hashnode.com/posts/imported-files-stay-on-your-device-how-pounce-atlas-handles-csv-and-json/6ae70d5097d0d1c7097ee68f) ### [Imported files stay on your device: how Pounce Atlas handles CSV and JSON](https://pounceza.hashnode.dev/imported-files-stay-on-your-device-how-pounce-atlas-handles-csv-and-json?utm_source=hashnode&utm_medium=feed) Pounce Atlas is an open-source explorer for geographic datasets. It can load your own CSV or JSON file in the browser. This post explains what the app does with that file, what it does not do, and wha 2 min read · [pounceza.hashnode.dev](https://pounceza.hashnode.dev/imported-files-stay-on-your-device-how-pounce-atlas-handles-csv-and-json?utm_source=hashnode&utm_medium=feed) [Pounce Za](https://hashnode.com/@pounceza) · [Nov 1](https://hashnode.com/posts/an-announcement-isn-t-an-opening-separating-event-observation-and-snapshot-dates/6ae70a3e44ce92a34e9d2832) ### [An announcement isn’t an opening: separating event, observation and snapshot dates](https://pounceza.hashnode.dev/an-announcement-isn-t-an-opening-separating-event-observation-and-snapshot-dates?utm_source=hashnode&utm_medium=feed) Disclosure: AI assisted the drafting of this article; Pounce reviewed it against the public Atlas source. Pounce builds Pounce Atlas, an open-source explorer for geographic datasets. Its examples are 5 min read · [pounceza.hashnode.dev](https://pounceza.hashnode.dev/an-announcement-isn-t-an-opening-separating-event-observation-and-snapshot-dates?utm_source=hashnode&utm_medium=feed) [anders lee](https://hashnode.com/@anderslee) · [Oct 31](https://hashnode.com/posts/modeling-florida-s-amendment-3-property-tax-exemption-county-by-county-in-python/6ae5b01fe5216b0b3e70d59a) ### [Modeling Florida's Amendment 3 property tax exemption, county by county, in Python](https://anders.hashnode.dev/modeling-florida-s-amendment-3-property-tax-exemption-county-by-county-in-python?utm_source=hashnode&utm_medium=feed) Florida votes on Amendment 3 on November 3, 2026. The ballot summary is one sentence long, but the question every homeowner actually has — what does this do to my bill? — depends on two numbers that d 5 min read · [anders.hashnode.dev](https://anders.hashnode.dev/modeling-florida-s-amendment-3-property-tax-exemption-county-by-county-in-python?utm_source=hashnode&utm_medium=feed) [anders lee](https://hashnode.com/@anderslee) · [Oct 30](https://hashnode.com/posts/a-180-page-reference-site-for-the-price-of-a-domain-astro-cloudflare-workers/6ae494f16f3679e53eb0abf6) ### [A 180-page reference site for the price of a domain (Astro + Cloudflare Workers)](https://anders.hashnode.dev/a-180-page-reference-site-for-the-price-of-a-domain-astro-cloudflare-workers?utm_source=hashnode&utm_medium=feed) Checking every row of the Indian steel section tables (IS 808) with physics found typos that survived 30 years, and a 1964 value most weight charts st 4 min read · [anders.hashnode.dev](https://anders.hashnode.dev/a-180-page-reference-site-for-the-price-of-a-domain-astro-cloudflare-workers?utm_source=hashnode&utm_medium=feed) [Rene Haase](https://hashnode.com/@renehaase) · [Oct 28](https://hashnode.com/posts/six-ways-an-ml-pipeline-fools-itself-and-the-devices-that-caught-them/6ae21d2ea4091ff76607cc1b) ### [Six ways an ML pipeline fools itself (and the devices that caught them)](https://renehaase.hashnode.dev/six-ways-an-ml-pipeline-fools-itself-and-the-devices-that-caught-them?utm_source=hashnode&utm_medium=feed) I run a nightly pipeline that trains scoring models for sixteen stock chart pattern detectors. It has run nearly 800 times since May 2026, and most of its 88,000 lines of Python are not modelling. The 3 min read · [renehaase.hashnode.dev](https://renehaase.hashnode.dev/six-ways-an-ml-pipeline-fools-itself-and-the-devices-that-caught-them?utm_source=hashnode&utm_medium=feed) [Atlas Data](https://hashnode.com/@atlasdata) · [Oct 27](https://hashnode.com/posts/compare-salaries-and-hiring-across-countries-with-glassdoor-job-data-and-python/6ae1213965408af578550406) ### [Compare salaries and hiring across countries with Glassdoor job data and Python](https://atlasdata.hashnode.dev/compare-salaries-and-hiring-across-countries-with-glassdoor-job-data-and-python?utm_source=hashnode&utm_medium=feed) "What does a data analyst earn in London compared to New York?" sounds like a question with an easy answer. In practice salary data is scattered across reports with different dates, definitions and sa 10 min read · [atlasdata.hashnode.dev](https://atlasdata.hashnode.dev/compare-salaries-and-hiring-across-countries-with-glassdoor-job-data-and-python?utm_source=hashnode&utm_medium=feed)