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      <title>Textual DirectoryTree 檔案瀏覽器：安全路徑、非同步預覽與互動測試</title>
      <link>https://dailypypy.org/learn/textual-directorytree-file-browser/</link>
      <pubDate>Thu, 08 Oct 2026 11:28:00 +0800</pubDate>
      
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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, full body, from below, kneeling beside several translucent floating blank folder panels, reaching toward one softly glowing panel with one hand, alert confident smile, looking at viewer, pastel lilac and soft pistachio background, subtle branching file-tree lines and small folder shapes without symbols, logos, markings, numbers, letters, or text, 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: This is a focused DirectoryTree file-browser follow-up to ../python-textual/, ../textual-background-workers/, ../textual-testing-pilot-snapshot/, ../python-pathlib/, and ../python-shutil/. Those posts teach general Textual widgets, generic background work, broad Pilot/snapshot testing, or general filesystem APIs. This article instead centers lazy DirectoryTree traversal, root-boundary and symlink checks, selection messages, bounded asynchronous text preview, stale-result suppression, reload behavior, and filesystem-backed interaction tests.
source check: Reviewed against the official Textual DirectoryTree, Tree, workers, and testing documentation on 2026-10-08. Examples were checked with Textual 8.2.8 and use FileSelected/DirectorySelected messages, filter_paths, reload, public worker APIs, and run_test/Pilot.
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