https://dailypypy.org/tags/categorical/ Recent content in Categorical on 每日拍拍 Hugo -- gohugo.io zh-tw © 2026 每日拍拍 Thu, 29 Oct 2026 11:39:00 +0800 155076163427069952 154825760438254592 https://dailypypy.org/learn/polars-enum-categorical-contracts/ Thu, 29 Oct 2026 11:39:00 +0800 https://dailypypy.org/learn/polars-enum-categorical-contracts/ <!--- 1440x768 prompt: masterpiece, best quality, highres, clean anime illustration, japanese anime style, soft shading, flat color design, 1girl, black hair, green eyes, white off-shoulder shirt, black short skirt, three-quarter upper body from slightly below, arms folded loosely across her waist, calm determined expression with a subtle closed-mouth smile, looking at viewer, pastel powder lilac background, neat composition, detailed eyes, cute and smart vibe, minimal background, polished illustration, no text negative prompt: worst quality, bad eye, bad hand, extra limbs, manga, multiple views, monochrome, text, signature dedup note: A vocabulary-contract follow-up to ../python-polars/, not another DataFrame survey. ../python-enum/ owns Python constant classes and state transitions; ../polars-join-cardinality-validation/ owns relational cardinality. This article instead owns fixed/discovered column vocabulary, unknown/null quarantine, business ordering, compatible batch dtypes, vocabulary migration and serialization assertions. Current 205-source inventory and nearest full sources checked before drafting. source check: Official categorical guide and installed Polars 2.1.0 docstrings inspected 2026-10-29. Categories is unstable; StringCache is deprecated and a no-op in this version. All data and policies are fictional. verification: Nine exact Python blocks parsed and demo passed; 18 pytest cases passed on Python 3.12 / Polars 2.1.0, including eight reader-facing cases and ten extended schema/vocabulary/round-trip checks. All 11 rendered code blocks match the source. Nearest current-source character 5-gram Jaccard 0.075102 versus Join cardinality; manual scope review confirms different reader task. ComfyUI prompt b80a4da1-63de-42ed-8272-317133c4053f produced DAILYPYPY_00150_.png; PNG 1440x768 and visual face/hands/text/artifact check passed. publication note: Required random date is retained; publishDate permits morning publication with buildFuture=false. ---> <h2 class="relative group">一. 前言：銀牌竟然排在金牌後面？ <div id="一-前言銀牌竟然排在金牌後面" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100"> <a class="group-hover:text-primary-300 dark:group-hover:text-neutral-700" style="text-decoration-line: none !important;" href="#%e4%b8%80-%e5%89%8d%e8%a8%80%e9%8a%80%e7%89%8c%e7%ab%9f%e7%84%b6%e6%8e%92%e5%9c%a8%e9%87%91%e7%89%8c%e5%be%8c%e9%9d%a2" aria-label="定位點">#</a> </span> </h2> <p>嗨，我是拍拍君。今天替客服工單整理會員等級。 報表想依「銅牌、銀牌、金牌」排序，程式卻排成 bronze、gold、silver。 隔天另一批又冒出 <code>Gold</code>、空字串和 <code>platinum</code>，大家都說自己沒改 schema。</p>