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Upload index.html with huggingface_hub

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  <!doctype html>
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- <html>
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- <head>
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- <meta charset="utf-8" />
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- <meta name="viewport" content="width=device-width" />
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- <title>My static Space</title>
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- <link rel="stylesheet" href="style.css" />
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- </head>
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- <body>
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- <div class="card">
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- <h1>Welcome to your static Space!</h1>
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- <p>You can modify this app directly by editing <i>index.html</i> in the Files and versions tab.</p>
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- <p>
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- Also don't forget to check the
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- <a href="https://huggingface.co/docs/hub/spaces" target="_blank">Spaces documentation</a>.
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- </p>
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- </div>
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- </body>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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  </html>
 
1
  <!doctype html>
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+ <html lang="en">
3
+ <head>
4
+ <meta charset="utf-8">
5
+ <meta name="viewport" content="width=device-width,initial-scale=1">
6
+ <title>Flit Migration guide — map setup files to flit config</title>
7
+ <meta name="description" content="This free browser tool maps setup.py, setup.cfg, and older project configuration to replacement Flit settings and shows build blockers.">
8
+ <style>
9
+ :root{color-scheme:light}body{margin:0;font:15px/1.55 system-ui,-apple-system,"Segoe UI",sans-serif;background:#faf9f5;color:#1a1512}
10
+ .wrap{max-width:960px;margin:0 auto;padding:28px 18px 60px}h1{font-size:26px;margin:0 0 6px}.lede{color:#4a403a;margin:0 0 16px}
11
+ textarea{width:100%;min-height:260px;font:13px/1.45 ui-monospace,Menlo,Consolas,monospace;padding:12px;border:1px solid #d9d0c4;border-radius:8px;box-sizing:border-box}
12
+ .bar{display:flex;gap:10px;align-items:center;margin:12px 0}button{font:600 15px system-ui;padding:10px 18px;border:0;border-radius:8px;background:#1a1512;color:#fff;cursor:pointer}
13
+ input[type=date]{font:14px system-ui;padding:8px;border:1px solid #d9d0c4;border-radius:6px}
14
+ table{border-collapse:collapse;width:100%;font-size:14px;margin-top:10px}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid #eee;vertical-align:top}th{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:#7a6e65}
15
+ .sev.error{color:#a8551f;font-weight:700}.sev.warn,.sev.warning{color:#96691f}.ok{color:#2a6446;font-weight:600}.sum{font-weight:600}
16
+ .note{font-size:13px;color:#7a6e65;margin-top:18px}#paid{margin-top:22px;padding:14px 16px;border:1px solid #e2d8cb;border-radius:10px;background:#fffdfa}
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+ </style>
18
+ <script data-grow-initializer="">!(function(){window.growMe||((window.growMe=function(e){window.growMe._.push(e);}),(window.growMe._=[]));var e=document.createElement("script");(e.type="text/javascript"),(e.src="https://faves.grow.me/main.js"),(e.defer=!0),e.setAttribute("data-grow-faves-site-id","U2l0ZTphZjljMzgyMC0yMmU5LTRhYjgtYTIxNS03OTRhMGY1N2ExYzM=");var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t);})();</script>
19
+ <!--yj-canon-s101--><link rel="canonical" href="https://getreadystack.com/tools/flit-migration-check"><style data-yj-mfit="1">#out{max-width:100%}#out td,#out th{overflow-wrap:anywhere}#out pre,#out code{white-space:pre-wrap;overflow-wrap:anywhere}@media (max-width:640px){table{display:block;max-width:100%;overflow-x:auto}pre{max-width:100%;overflow-x:auto}code,a{overflow-wrap:anywhere}img,svg,video,canvas,iframe{max-width:100%}textarea,input,select{max-width:100%;box-sizing:border-box}.yj-lgbar{position:static!important;justify-content:flex-end;margin:0 0 10px}h1,h2,h3,h4,p,li,dd,dt,blockquote,figcaption,summary,label,.res,.lead{overflow-wrap:anywhere}label{max-width:100%;box-sizing:border-box}#out table:not(:has(tr>:nth-child(4))){display:table;table-layout:fixed;width:100%}#out table:has(tr>:nth-child(4)),#out table:has(tr>:nth-child(4)) tbody,#out table:has(tr>:nth-child(4)) tr,#out table:has(tr>:nth-child(4)) td{display:block;width:auto;overflow:visible}#out table:has(tr>:nth-child(4)) thead{display:none}#out table:has(tr>:nth-child(4)) tr{padding:10px 0;border-bottom:1px solid rgba(128,128,128,.28)}#out table:has(tr>:nth-child(4)) td{border:0;padding:1px 0}#out table:has(tr>:nth-child(4)) td:nth-child(-n+3){display:inline-block;margin-right:10px;font-size:12px;opacity:.78}}</style>
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+ </head>
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+ <body>
22
+ <div class="wrap">
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+ <h1>Flit Migration guide — map setup files to flit config</h1>
24
+ <p class="lede">Flit migration map for Python packages: finds every setup.py, setup.cfg and setuptools/old-flit pyproject.toml line and prints the exact flit_core 4 [project] line that replaces it, plus the blockers Flit cannot build. Runs entirely in your browser — nothing is uploaded.</p>
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+ <textarea id="src" spellcheck="false"># setup.py for "tidyframe" -- the file this project still builds from
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+ import os
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+ from setuptools import setup, find_packages
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+
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+ here = os.getcwd()
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+ with open(os.path.join(here, "README.md")) as f:
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+ readme = f.read()
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+
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+ setup(
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+ name="tidyframe",
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+ version="2.4.1",
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+ description="Tidy helpers for pandas frames",
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+ long_description=readme,
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+ long_description_content_type="text/markdown",
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+ author="Dana Example",
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+ author_email="dana@example.org",
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+ url="https://github.com/example/tidyframe",
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+ license="MIT",
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+ packages=find_packages(exclude=["tests"]),
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+ package_dir={"": "src"},
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+ include_package_data=True,
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+ package_data={"tidyframe": ["schemas/*.json"]},
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+ data_files=[("share/man/man1", ["docs/tidyframe.1"])],
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+ python_requires="&gt;=3.8",
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+ setup_requires=["wheel"],
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+ install_requires=["pandas&gt;=2.0", "click&gt;=8"],
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+ extras_require={"test": ["pytest&gt;=7"], "docs": ["sphinx"]},
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+ entry_points={
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+ "console_scripts": ["tidyframe=tidyframe.cli:main"],
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+ "pandas_plugins": ["tidy=tidyframe.plugin:register"],
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+ },
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+ classifiers=["License :: OSI Approved :: MIT License"],
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+ )</textarea>
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+ <div class="bar"><button id="go">Check</button><label>as of <input type="date" id="today"></label></div>
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+ <div id="out" aria-live="polite"></div>
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+ <div id="paid"><strong>Free here:</strong> Check the open setup.py, setup.cfg or pyproject.toml: every setuptools or old-flit line with its line number and the exact flit_core 4 replacement line, plus the blockers Flit cannot build. <strong>In the editor:</strong> Whole workspace: one dated migration plan mapping every item in every package to its flit_core 4 replacement, and a team CI gate that fails a build adding new setuptools-only use. — that part asks for a licence key. <a href="https://getreadystack.com/api/buy/cl/polar_cl_VI4ER6LWKbRiLZHzzqUpAK77hPReaZmifZSkj19xgaN">Workspace migration plan + team CI gate — $29 once</a></div>
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+ <p class="note">Same engine as the VS Code extension, byte for byte.</p>
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+ </div>
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+ <script>var FLIT_RULES = [
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+ {
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+ "id": "SP01",
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+ "check": "setuptools_setup_py",
67
+ "files": [
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+ "setup.py"
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+ ],
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+ "re": "^\\s*(from\\s+(setuptools|distutils)[\\w.]*\\s+import|import\\s+(setuptools|distutils))",
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+ "sev": "warn",
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+ "msg": "setup.py drives this build; flit_core reads no setup.py",
73
+ "fix": "delete setup.py; in pyproject.toml write [build-system] requires = [\"flit_core \u003e=3.11,\u003c5\"] and build-backend = \"flit_core.buildapi\"",
74
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ {
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+ "id": "SP02",
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+ "check": "compiled_extension",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg"
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+ ],
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+ "re": "\\bext_modules\\s*=|\\bExtension\\s*\\(|\\bcythonize\\s*\\(|\\bPybind11Extension\\b",
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+ "sev": "error",
85
+ "msg": "BLOCKER: compiled extension; Flit builds pure Python packages only (\"If your package needs a build step, you won't be able to use Flit\")",
86
+ "fix": "keep setuptools for this package, or split the pure-Python part into its own Flit package",
87
+ "source": "https://flit.pypa.io/en/stable/rationale.html"
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+ },
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+ {
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+ "id": "SP03",
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+ "check": "custom_cmdclass",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg"
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+ ],
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+ "re": "\\bcmdclass\\s*=",
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+ "sev": "error",
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+ "msg": "BLOCKER: custom build command (cmdclass); flit_core runs no build hooks",
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+ "fix": "move the generated file into the source tree before the build, or keep setuptools",
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+ "source": "https://flit.pypa.io/en/stable/rationale.html"
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+ },
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+ {
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+ "id": "SP04",
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+ "re": "\\bsetup_requires\\s*=",
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+ "sev": "warn",
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+ "msg": "setup_requires has no Flit equivalent",
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+ "fix": "list build tools in [build-system] requires; runtime needs go in [project] dependencies",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ "msg": "install_requires",
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+ "fix": "[project] dependencies = [\"requests \u003e=2.6\", ...] (same specifiers and ; markers)",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ "msg": "extras_require",
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+ "sev": "warn",
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+ ],
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+ "re": "\\bentry_points\\s*=|^\\s*\\[options\\.entry_points\\]",
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+ "sev": "info",
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+ "msg": "entry_points block",
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+ "fix": "other groups become [project.entry-points.\"group.name\"] (quote a dotted group); console_scripts/gui_scripts go to [project.scripts]/[project.gui-scripts]",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ {
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+ "id": "SP10",
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+ "check": "data_files",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg"
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+ ],
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+ "re": "\\bdata_files\\s*=",
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+ "sev": "warn",
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+ "msg": "data_files installs files outside the package",
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+ "fix": "put them under data/ and add [tool.flit.external-data] directory = \"data\" (flit_core \u003e=3.7)",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ {
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+ "id": "SP11",
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+ "check": "package_data",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg"
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+ ],
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+ "re": "\\b(package_data|include_package_data|exclude_package_data)\\s*=|^\\s*\\[options\\.package_data\\]",
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+ "sev": "info",
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+ "msg": "package_data / include_package_data",
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+ "fix": "delete it: Flit includes data files inside the package folder automatically",
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+ "source": "https://flit.pypa.io/en/stable/rationale.html"
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+ },
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+ {
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+ "id": "SP12",
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+ "check": "package_dir",
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+ "re": "\\bpackage_dir\\s*=",
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+ "sev": "info",
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+ "msg": "package_dir",
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+ "fix": "delete it: Flit finds the package next to pyproject.toml or in src/; if the import name differs from the PyPI name add [tool.flit.module] name = \"importname\"",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ {
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+ "sev": "info",
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+ "msg": "packages / find_packages()",
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+ "fix": "delete it: name only the top-level import package; Flit includes its subpackages automatically",
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+ "source": "https://flit.pypa.io/en/stable/rationale.html"
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+ },
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+ {
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+ "id": "SP14",
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+ "check": "static_version",
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+ "files": [
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+ "setup.cfg"
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+ ],
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+ "re": "^\\s*version\\s*=\\s*(['\\\"]|[\\d])",
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+ "sev": "info",
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+ "msg": "version set in setup metadata",
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+ "fix": "[project] version = \"1.2.3\", or drop it and add dynamic = [\"version\"] so Flit reads {DV} from the package",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ {
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+ "id": "SP15",
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+ "check": "attr_version",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg"
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+ ],
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+ "re": "version\\s*=\\s*attr\\s*:|version\\s*=\\s*(get_version|read_version)\\s*\\(",
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+ "sev": "info",
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+ "msg": "version read from code at build time",
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+ "fix": "dynamic = [\"version\"]; Flit reads {DV} from the top-level module itself",
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+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ {
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+ "id": "SP16",
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+ "check": "scm_version",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg",
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+ "pyproject.toml"
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+ ],
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+ "re": "use_scm_version|setuptools_scm|setuptools-scm|versioneer",
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+ "sev": "error",
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+ "msg": "BLOCKER: version from git tags (setuptools_scm/versioneer); Flit dynamic accepts only version, description, import-names, import-namespaces",
269
+ "fix": "write the version into {DV} in the package and add dynamic = [\"version\"]",
270
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
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+ },
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+ {
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+ "id": "SP17",
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+ "check": "python_requires",
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+ "files": [
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+ "setup.py",
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+ "setup.cfg"
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+ ],
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+ "re": "\\bpython_requires\\s*=",
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+ "sev": "warn",
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+ "msg": "python_requires",
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+ "fix": "[project] requires-python = \"\u003e=3.8\" (flit_core 4 itself needs Python 3.8+ to build)",
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+ "source": "https://flit.pypa.io/en/stable/history.html"
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+ },
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+ {
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+ "id": "SP18",
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+ "check": "long_description",
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+ ],
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+ "sev": "warn",
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+ "msg": "long_description",
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+ "fix": "[project] readme = \"README.md\" (.md, .rst or .txt picks the content type)",
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+ "id": "SP19",
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+ "check": "legacy_license",
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+ "sev": "info",
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+ "msg": "author / author_email",
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+ "fix": "[project] authors = [{ name = \"Jane Doe\", email = \"jane@example.org\" }]",
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+ "check": "url_fields",
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+ "sev": "info",
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+ "msg": "url / project_urls",
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+ "fix": "[project.urls] Source = \"https://github.com/you/pkg\"",
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+ "id": "SP23",
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+ "check": "classifiers",
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+ "re": "\\bclassifiers\\s*=",
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+ "sev": "info",
359
+ "msg": "classifiers",
360
+ "fix": "[project] classifiers = [...] (add \"Private :: Do Not Upload\" to block an accidental PyPI upload)",
361
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
362
+ },
363
+ {
364
+ "id": "SP24",
365
+ "check": "name_description",
366
+ "files": [
367
+ "setup.py",
368
+ "setup.cfg"
369
+ ],
370
+ "re": "^\\s*(name|description)\\s*=",
371
+ "sev": "info",
372
+ "msg": "name / description",
373
+ "fix": "[project] name = \"tidyframe\"; description = \"...\" or dynamic = [\"description\"] to take the module docstring",
374
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
375
+ },
376
+ {
377
+ "id": "SC01",
378
+ "check": "setup_cfg_metadata",
379
+ "files": [
380
+ "setup.cfg"
381
+ ],
382
+ "re": "^\\s*\\[(metadata|options)\\]",
383
+ "sev": "warn",
384
+ "msg": "setup.cfg [metadata]/[options] section",
385
+ "fix": "move each key into the standard [project] table of pyproject.toml, then delete setup.cfg",
386
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
387
+ },
388
+ {
389
+ "id": "PP01",
390
+ "check": "non_flit_backend",
391
+ "files": [
392
+ "pyproject.toml"
393
+ ],
394
+ "re": "^\\s*build-backend\\s*=\\s*\\\"(?!flit_core\\.buildapi)",
395
+ "sev": "warn",
396
+ "msg": "build-backend is not flit_core",
397
+ "fix": "build-backend = \"flit_core.buildapi\"",
398
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
399
+ },
400
+ {
401
+ "id": "PP02",
402
+ "check": "setuptools_requires",
403
+ "files": [
404
+ "pyproject.toml"
405
+ ],
406
+ "re": "^\\s*requires\\s*=.*\\b(setuptools|wheel|hatchling|poetry-core|poetry_core|pdm-backend)\\b",
407
+ "sev": "warn",
408
+ "msg": "[build-system] requires pulls another backend",
409
+ "fix": "requires = [\"flit_core \u003e=3.11,\u003c5\"]",
410
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
411
+ },
412
+ {
413
+ "id": "PP03",
414
+ "check": "tool_flit_metadata",
415
+ "files": [
416
+ "pyproject.toml"
417
+ ],
418
+ "re": "^\\s*\\[tool\\.flit\\.metadata(\\.[\\w-]+)?\\]",
419
+ "sev": "error",
420
+ "msg": "[tool.flit.metadata] is no longer read by flit_core 4.0 (on PyPI 2026-08-04)",
421
+ "fix": "move the fields into [project], or pin requires = [\"flit_core \u003e=2,\u003c4\"]",
422
+ "source": "https://flit.pypa.io/en/stable/history.html"
423
+ },
424
+ {
425
+ "id": "PP04",
426
+ "check": "tool_flit_scripts",
427
+ "files": [
428
+ "pyproject.toml"
429
+ ],
430
+ "re": "^\\s*\\[tool\\.flit\\.(scripts|entrypoints[\\w.\\\"-]*)\\]",
431
+ "sev": "error",
432
+ "msg": "old Flit 3 scripts/entrypoints table (belongs to the [tool.flit.metadata] layout)",
433
+ "fix": "[project.scripts] and [project.entry-points.\"group\"]",
434
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
435
+ },
436
+ {
437
+ "id": "PP05",
438
+ "check": "flit_core_no_upper",
439
+ "files": [
440
+ "pyproject.toml"
441
+ ],
442
+ "re": null,
443
+ "sev": "warn",
444
+ "msg": "flit_core requirement has no \u003c5 upper bound",
445
+ "fix": "requires = [\"flit_core \u003e=3.11,\u003c5\"] (\"all packages should specify \u003c5\")",
446
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
447
+ },
448
+ {
449
+ "id": "PP06",
450
+ "check": "flit_core_lt4",
451
+ "files": [
452
+ "pyproject.toml"
453
+ ],
454
+ "re": null,
455
+ "sev": "warn",
456
+ "msg": "flit_core \u003c4 pin on a [project]-table package",
457
+ "fix": "change \u003c4 to \u003c5: flit_core 4.0 only drops [tool.flit.metadata]; [project] packages build unchanged",
458
+ "source": "https://flit.pypa.io/en/stable/history.html"
459
+ },
460
+ {
461
+ "id": "PP07",
462
+ "check": "spdx_needs_311",
463
+ "files": [
464
+ "pyproject.toml"
465
+ ],
466
+ "re": null,
467
+ "sev": "error",
468
+ "msg": "license = \"SPDX\" string needs flit_core \u003e=3.11 but the requirement allows older",
469
+ "fix": "requires = [\"flit_core \u003e=3.11,\u003c5\"]",
470
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
471
+ },
472
+ {
473
+ "id": "PP08",
474
+ "check": "spdx_with_needs_41",
475
+ "files": [
476
+ "pyproject.toml"
477
+ ],
478
+ "re": null,
479
+ "sev": "error",
480
+ "msg": "license expression with WITH needs flit_core \u003e=4.1 (released 2026-09-16)",
481
+ "fix": "requires = [\"flit_core \u003e=4.1,\u003c5\"]",
482
+ "source": "https://flit.pypa.io/en/stable/history.html"
483
+ },
484
+ {
485
+ "id": "PP09",
486
+ "check": "import_names_needs_4",
487
+ "files": [
488
+ "pyproject.toml"
489
+ ],
490
+ "re": null,
491
+ "sev": "error",
492
+ "msg": "import-names / import-namespaces need flit_core \u003e=4",
493
+ "fix": "requires = [\"flit_core \u003e=4,\u003c5\"]",
494
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
495
+ },
496
+ {
497
+ "id": "PP10",
498
+ "check": "bad_dynamic",
499
+ "files": [
500
+ "pyproject.toml"
501
+ ],
502
+ "re": null,
503
+ "sev": "error",
504
+ "msg": "dynamic lists a field Flit cannot fill (only version, description, import-names, import-namespaces)",
505
+ "fix": "write that field out in [project]",
506
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
507
+ },
508
+ {
509
+ "id": "PP11",
510
+ "check": "console_scripts_group",
511
+ "files": [
512
+ "pyproject.toml"
513
+ ],
514
+ "re": "^\\s*\\[project\\.entry-points\\.\\\"?(console_scripts|gui_scripts)\\\"?\\]",
515
+ "sev": "error",
516
+ "msg": "[project.entry-points.console_scripts] is not allowed",
517
+ "fix": "[project.scripts] (or [project.gui-scripts])",
518
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
519
+ },
520
+ {
521
+ "id": "PP12",
522
+ "check": "tool_setuptools",
523
+ "files": [
524
+ "pyproject.toml"
525
+ ],
526
+ "re": "^\\s*\\[tool\\.setuptools[\\w.\\\"-]*\\]",
527
+ "sev": "info",
528
+ "msg": "[tool.setuptools] table has no effect under flit_core",
529
+ "fix": "package-data: delete (automatic); packages.find/package-dir: [tool.flit.module] name = \"importname\"; data-files: [tool.flit.external-data]",
530
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
531
+ },
532
+ {
533
+ "id": "PP13",
534
+ "check": "tool_hatch_poetry",
535
+ "files": [
536
+ "pyproject.toml"
537
+ ],
538
+ "re": "^\\s*\\[tool\\.(hatch|poetry)[\\w.\\\"-]*\\]",
539
+ "sev": "info",
540
+ "msg": "[tool.hatch]/[tool.poetry] table is ignored by flit_core",
541
+ "fix": "dependencies/scripts go into [project]; build.targets.sdist include/exclude becomes [tool.flit.sdist] include/exclude",
542
+ "source": "https://flit.pypa.io/en/stable/pyproject_toml.html"
543
+ }
544
+ ];</script>
545
+ <script>/* Flit Migration Check engine: setup.py / setup.cfg / pyproject.toml -> flit_core 4 map. Runs in Node and in the browser. */
546
+ (function () {
547
+ var RULES = (typeof module !== 'undefined') ? require('./rules.json') : window.FLIT_RULES;
548
+ var DV = '_' + '_version_' + '_';
549
+ var DYN_OK = ['version', 'description', 'import-names', 'import-namespaces'];
550
+
551
+ function detectKind(text, opts) {
552
+ var f = (opts && opts.filename) ? String(opts.filename).toLowerCase() : '';
553
+ if (/pyproject\.toml$/.test(f)) return 'pyproject.toml';
554
+ if (/setup\.cfg$/.test(f)) return 'setup.cfg';
555
+ if (/\.py$/.test(f)) return 'setup.py';
556
+ if (/^\s*\[(build-system|project|tool\.[\w-]+)[\].]/m.test(text)) return 'pyproject.toml';
557
+ if (/^\s*\[(metadata|options[\w.]*)\]/m.test(text)) return 'setup.cfg';
558
+ if (/\bsetup\s*\(|\bimport\s+setuptools|\bfrom\s+(setuptools|distutils)/.test(text)) return 'setup.py';
559
+ return '';
560
+ }
561
+
562
+ function ver(s) {
563
+ var p = String(s).split('.').map(function (x) { return parseInt(x, 10) || 0; });
564
+ return (p[0] || 0) * 10000 + (p[1] || 0) * 100 + (p[2] || 0);
565
+ }
566
+
567
+ function fmt(rule) {
568
+ return (rule.msg + ' -> ' + rule.fix).split('{DV}').join(DV);
569
+ }
570
+
571
+ function check(text, opts) {
572
+ opts = opts || {};
573
+ var kind = detectKind(text, opts);
574
+ var findings = [];
575
+ if (!kind) return { kind: '', findings: findings, blockers: 0, ready: false };
576
+ var lines = String(text).split(/\r?\n/);
577
+ var byId = {};
578
+ RULES.forEach(function (r) { byId[r.id] = r; });
579
+ function add(rule, line) {
580
+ findings.push({ check: rule.id + ' ' + rule.check, sev: rule.sev, msg: fmt(rule), line: line, fix: rule.fix.split('{DV}').join(DV), source: rule.source });
581
+ }
582
+ var section = '';
583
+ var st = { reqLine: 0, req: '', inReq: false, licLine: 0, lic: '', impLine: 0, hasProject: false, hasFlitMeta: false };
584
+ lines.forEach(function (raw, i) {
585
+ var ln = i + 1;
586
+ var t = raw.trim();
587
+ if (!t || t.charAt(0) === '#' || (kind === 'setup.cfg' && t.charAt(0) === ';')) return;
588
+ var h = /^\[([^\]]+)\]/.exec(t);
589
+ if (h && kind !== 'setup.py') section = h[1].trim();
590
+ RULES.forEach(function (r) {
591
+ if (!r.re || r.files.indexOf(kind) < 0) return;
592
+ if (new RegExp(r.re).test(raw)) add(r, ln);
593
+ });
594
+ if (kind !== 'pyproject.toml') return;
595
+ if (section === 'project') st.hasProject = true;
596
+ if (/^tool\.flit\.metadata/.test(section)) st.hasFlitMeta = true;
597
+ if (section === 'build-system' && /^requires\s*=/.test(t)) { st.reqLine = ln; st.inReq = true; st.req = ''; }
598
+ if (st.inReq) { st.req += ' ' + t; if (/\]/.test(t)) st.inReq = false; }
599
+ if (section === 'project') {
600
+ var lic = /^license\s*=\s*"([^"]*)"/.exec(t);
601
+ if (lic) { st.licLine = ln; st.lic = lic[1]; }
602
+ if (/^import-(names|namespaces)\s*=/.test(t) && !st.impLine) st.impLine = ln;
603
+ var dyn = /^dynamic\s*=\s*\[([^\]]*)\]/.exec(t);
604
+ if (dyn) {
605
+ var items = (dyn[1].match(/"([^"]+)"|'([^']+)'/g) || []).map(function (s) { return s.slice(1, -1); });
606
+ if (items.indexOf('import-names') >= 0 || items.indexOf('import-namespaces') >= 0) st.impLine = st.impLine || ln;
607
+ var bad = items.filter(function (x) { return DYN_OK.indexOf(x) < 0; });
608
+ if (bad.length) {
609
+ var r10 = byId.PP10;
610
+ findings.push({ check: r10.id + ' ' + r10.check, sev: r10.sev, msg: fmt(r10) + ' (' + bad.join(', ') + ')', line: ln, fix: r10.fix, source: r10.source });
611
+ }
612
+ }
613
+ }
614
+ });
615
+ if (kind === 'pyproject.toml') {
616
+ var m = /flit[_-]core\s*([^"'\]]*)/i.exec(st.req);
617
+ if (m) {
618
+ var spec = m[1];
619
+ var lo = /(?:>=|~=|==)\s*([\d.]+)/.exec(spec);
620
+ var lower = lo ? ver(lo[1]) : 0;
621
+ if (/<\s*4\b/.test(spec)) { if (st.hasProject && !st.hasFlitMeta) add(byId.PP06, st.reqLine); }
622
+ else if (!/<\s*5\b/.test(spec)) add(byId.PP05, st.reqLine);
623
+ if (st.licLine && lower < ver('3.11')) add(byId.PP07, st.licLine);
624
+ if (st.licLine && /\bWITH\b/.test(st.lic) && lower < ver('4.1')) add(byId.PP08, st.licLine);
625
+ if (st.impLine && lower < ver('4')) add(byId.PP09, st.impLine);
626
+ }
627
+ }
628
+ findings.sort(function (a, b) { return a.line - b.line; });
629
+ var blockers = findings.filter(function (f) { return /BLOCKER/.test(f.msg); }).length;
630
+ return { kind: kind, findings: findings, blockers: blockers, ready: findings.length === 0 };
631
+ }
632
+
633
+ var api = { engine: { check: check, detectKind: detectKind }, RULES: RULES, RULE_COUNT: RULES.length };
634
+ if (typeof module !== 'undefined') module.exports = api;
635
+ if (typeof window !== 'undefined') window.FLITENGINE = api;
636
+ })();
637
+ </script>
638
+ <script>// ⛔뼈대 — kit/scaffold.py 가 찍는다 (s143). findings [{check,sev,msg,line?}] → 글/HTML. 같은 파일이 Node 와 브라우저에서 산다.
639
+ 'use strict';
640
+ function escapeHtml(s) { return String(s == null ? '' : s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;'); }
641
+ function summaryLine(res) {
642
+ const f = (res && res.findings) || []; const e = f.filter(function (x) { return String(x.sev || 'error').toLowerCase().startsWith('err'); }).length;
643
+ return f.length ? (f.length + ' finding' + (f.length === 1 ? '' : 's') + ' (' + e + ' error' + (e === 1 ? '' : 's') + ')') : 'Clean — no findings.';
644
+ }
645
+ function toText(res, label) {
646
+ const f = (res && res.findings) || [];
647
+ const lines = ['== ' + (label || '') + ' — ' + summaryLine(res)];
648
+ f.forEach(function (x) { lines.push(' ' + String(x.sev || 'error').toUpperCase().slice(0, 4) + ' ' + (x.line ? 'L' + x.line + ' ' : '') + (x.check || x.id || '') + ' ' + (x.msg || x.message || '')); });
649
+ return lines.join('\n');
650
+ }
651
+ function toHtml(res) {
652
+ const f = (res && res.findings) || [];
653
+ if (!f.length) return '<p class="ok">' + escapeHtml(summaryLine(res)) + '</p>';
654
+ const rows = f.map(function (x) { return '<tr><td class="sev ' + escapeHtml(String(x.sev || 'error')) + '">' + escapeHtml(String(x.sev || 'error')) + '</td><td>' + (x.line ? 'L' + escapeHtml(x.line) : '') + '</td><td><code>' + escapeHtml(x.check || x.id || '') + '</code></td><td>' + escapeHtml(x.msg || x.message || '') + '</td></tr>'; }).join('');
655
+ return '<p class="sum">' + escapeHtml(summaryLine(res)) + '</p><table><thead><tr><th>Level</th><th>Line</th><th>Check</th><th>What</th></tr></thead><tbody>' + rows + '</tbody></table>';
656
+ }
657
+ var FLITREPORT = { escapeHtml: escapeHtml, summaryLine: summaryLine, toText: toText, toHtml: toHtml };
658
+ if (typeof module !== 'undefined' && module.exports) module.exports = FLITREPORT;
659
+ else window.FLITREPORT = FLITREPORT;
660
+ </script>
661
+ <script>
662
+ (function(){
663
+ var src=document.getElementById('src'), out=document.getElementById('out'), go=document.getElementById('go'), today=document.getElementById('today');
664
+ today.value=new Date().toISOString().slice(0,10);
665
+ function run(){ try { var res=window.FLITENGINE.engine.check(src.value,{today:today.value}); out.innerHTML=window.FLITREPORT.toHtml(res); } catch(e){ out.innerHTML='<p class="sev error">Could not run: '+String(e.message||e)+'</p>'; } }
666
+ go.onclick=run; if (src.value.trim()) run();
667
+ })();
668
+ </script>
669
+
670
+
671
+ <section data-yj-install="free" style="margin:2rem auto 1rem;max-width:46rem;padding:1.25rem 1.25rem;border:1px solid #cfe3d6;border-radius:12px;background:#f6fbf8;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .4rem;font-size:1.2rem">Install free</h2><p style="margin:0 0 .8rem;color:#41505f">Free for the file open in your editor - no key, no limit. The workspace sweep and the report ask for a key.</p><a href="https://open-vsx.org/extension/readystack/flit-migration-check" rel="noopener" data-yj-install-door="ovsx" onclick="try{navigator.sendBeacon('/api/ev',new Blob([JSON.stringify({t:'install',slug:'flit-migration-check',src:'ovsx',path:location.pathname})],{type:'application/json'}))}catch(e){}" style="display:inline-block;margin:0 .5rem .5rem 0;padding:.6rem 1rem;border-radius:8px;background:#0f7b3f;color:#fff;text-decoration:none;font-weight:600">Open VSX (Cursor, VSCodium)</a><p style="margin:.6rem 0 0;font-size:.92rem;color:#41505f"><a href="https://getreadystack.com/api/buy/team" rel="nofollow" style="color:#0f7b3f;text-decoration:underline">Team? One key for every ReadyStack linter, 5 seats, $149 once</a></p></section>
672
+ <section data-yj-alert="rule" style="margin:1rem auto 1.5rem;max-width:46rem;padding:1.1rem 1.25rem;border:1px solid #d9dee6;border-radius:12px;background:#fbfcfd;font:15px/1.55 system-ui,-apple-system,Segoe UI,sans-serif"><b style="font-size:1.05rem">Get one email when this rule changes</b><div style="opacity:.78;margin:.35rem 0 .8rem">We watch the regulation and vendor sources behind Flit Migration Check: setup.py to flit_core 4 every day. When a rule changes, you get a single email with what changed and the updated check. No newsletter.</div><div style="display:flex;gap:8px;flex-wrap:wrap"><input id="yjae" type="email" placeholder="you@example.com" style="flex:1;min-width:210px;padding:11px 13px;border:1px solid rgba(140,150,165,.34);border-radius:8px;background:#fff;color:inherit"><button id="yjab" style="padding:11px 18px;border-radius:8px;border:0;cursor:pointer;background:#0f7b3f;color:#fff;font:600 15px system-ui,sans-serif">Notify me</button></div><div id="yjao" hidden style="margin-top:.6rem;color:#0f7b3f">You're on the list. One email when it changes.</div><script>(function(){var b=document.getElementById("yjab"),e=document.getElementById("yjae");if(!b||!e)return;b.addEventListener("click",function(){var v=e.value.trim();if(!/.+@.+\..+/.test(v))return;try{localStorage.setItem("yj_em","1");}catch(_){}fetch(location.origin+"/api/subscribe",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({email:v,slug:"flit-migration-check",lang:"en",source:"rule_alert"+((b.closest&&b.closest("section")&&b.closest("section").getAttribute("data-yj-moved"))?"_at_result":"")})}).then(function(r){var o=document.getElementById("yjao");o.hidden=false;if(!r.ok){o.textContent="Could not save - please try again.";}}).catch(function(){var o=document.getElementById("yjao");o.hidden=false;o.textContent="Could not save - please try again.";});});})();</script><script>(function(){var e=document.getElementById("yjae"),s=e&&e.closest?e.closest("section"):null,o=document.getElementById("out");if(!s||!o)return;var d=false;function mv(ev){if(d)return;if(ev&&ev.target&&s.contains(ev.target))return;d=true;var b=o;while(b.parentNode&&b.parentNode!==document.body&&b.parentNode.tagName!=="MAIN"&&b.parentNode.tagName!=="ARTICLE")b=b.parentNode;if(!b.parentNode||b===s||b.contains(s))return;try{b.parentNode.insertBefore(s,b.nextSibling);s.setAttribute("data-yj-moved","1");}catch(_){}}document.addEventListener("input",mv,true);document.addEventListener("change",mv,true);document.addEventListener("click",function(ev){var b=ev.target&&ev.target.closest?ev.target.closest("button,input[type=submit]"):null;if(b&&!b.closest("[data-yj],[data-yj-cta],[data-yj-install],[data-yj-alert],.yj-find,.yj-related,#yj-ask,.yjp"))mv(ev);},true);})();</script></section>
673
+
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+ <section data-yj-cta="paid" style="margin:3rem auto;max-width:46rem;padding:1.5rem 1.25rem;border:1px solid #d8dee9;border-radius:12px;background:#fbfcfe;font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif"><h2 style="margin:0 0 .5rem;font-size:1.25rem">Get the full version <span class="yj-price">$29</span></h2><p class="yj-cta-paid" style="margin:.25rem 0 .6rem;color:#1f2a37">Workspace key ($29 once): every setup.py, setup.cfg and pyproject.toml in the workspace as one dated migration plan, each item mapped to its flit_core 4 replacement. Team key ($149): licence and end-of-life exposure report across projects plus a CI gate that fails a build adding new setuptools-only </p><p class="yj-cta-pay" style="margin:.25rem 0 1rem;color:#5b6b7c;font-size:.94rem">One payment, one licence key for this tool. The key is shown right after payment.</p><a href="https://getreadystack.com/api/buy/cl/polar_cl_VI4ER6LWKbRiLZHzzqUpAK77hPReaZmifZSkj19xgaN" rel="nofollow" style="display:inline-block;padding:.7rem 1.3rem;border-radius:8px;background:#1b64f2;color:#fff;text-decoration:none;font-weight:600">Buy the full version — $29</a></section>
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+ <!--yj-share-s101--><div style="margin:28px 0 8px;text-align:center"><button id="yjcp" type="button" style="font:inherit;padding:10px 18px;border:1px solid #8884;border-radius:10px;background:transparent;cursor:pointer">Copy link</button><button id="yjimg" type="button" style="font:inherit;padding:10px 18px;margin-left:8px;border:1px solid #8884;border-radius:10px;background:transparent;cursor:pointer">Save result as image</button></div><script>(function(){var b=document.getElementById("yjimg");if(!b)return;b.addEventListener("click",function(){var o=document.getElementById("out");var txt=(o&&(o.innerText||o.textContent)||"").trim();if(!txt){b.textContent="(no result yet)";setTimeout(function(){b.textContent="Save result as image";},1500);return;}var lines=txt.split(String.fromCharCode(10)).filter(function(x){return x.trim();}).slice(0,10);var W=1200,P=56,c=document.createElement("canvas");c.width=W;var lh=38,H=P*2+70+lines.length*lh+60;c.height=H;var x=c.getContext("2d");x.fillStyle="#1a1512";x.fillRect(0,0,W,H);x.fillStyle="#f3e9d2";x.font="600 34px system-ui,Segoe UI,Arial";var t=(document.title||"").split("|")[0].trim();x.fillText(t.slice(0,54),P,P+34);x.font="22px ui-monospace,Menlo,Consolas,monospace";x.fillStyle="#e8dcc4";for(var i=0;i<lines.length;i++){x.fillText(lines[i].slice(0,88),P,P+70+i*lh+22);}x.font="600 22px system-ui,Segoe UI,Arial";x.fillStyle="#c9a227";var d=location.hostname.replace("www.","");x.fillText(d,W-P-x.measureText(d).width,H-P+6);c.toBlob(function(bl){var u=URL.createObjectURL(bl),a=document.createElement("a");a.href=u;a.download=(t||"result").replace(/[^a-z0-9]+/gi,"-").toLowerCase()+"-"+d+".png";document.body.appendChild(a);a.click();setTimeout(function(){URL.revokeObjectURL(u);a.remove();},2000);},"image/png");});})();</script><script>(function(){var b=document.getElementById("yjcp");if(!b)return;var t=b.textContent;b.addEventListener("click",function(){var u=location.href.split("#")[0];function d(){b.textContent="Link copied";setTimeout(function(){b.textContent=t;},1800);}if(navigator.clipboard&&navigator.clipboard.writeText){navigator.clipboard.writeText(u).then(d,function(){prompt("",u);});}else{prompt("",u);}});})();</script>
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+ <p>Six setup.py lines from a sample Python package show what a Flit migration really is: install_requires becomes [project] dependencies, extras_require becomes [project.optional-dependencies], a console_scripts entry becomes [project.scripts], data_files becomes [tool.flit.external-data], python_requires becomes requires-python, and license=&quot;MIT&quot; becomes an SPDX license string that needs flit_core &gt;=3.11. If you maintain a pure-Python library on PyPI and you are moving from setuptools, Hatch or the old Flit 3 layout to flit_core 4, this is the list you would otherwise write by hand.</p>
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+ <h3>Migrate from setuptools to Flit: what changed in August and September 2026</h3>
681
+ <p>flit_core 4.0 (on PyPI 2026-08-04) no longer reads [tool.flit.metadata]. The Flit release history says it plainly: the old table &quot;is no longer used for project metadata&quot;; use the [project] table, or build with flit_core &lt;4. A package whose [build-system] asks for &quot;flit_core &gt;=3.2&quot; with no upper bound now receives flit_core 4 when pip builds it from the sdist, and the build stops.</p>
682
+ <p>flit_core 4.1 (on PyPI 2026-09-16) accepts license expressions with WITH, such as &quot;Apache-2.0 WITH LLVM-exception&quot;. That line needs &quot;flit_core &gt;=4.1,&lt;5&quot; in requires. A plain SPDX expression like &quot;MIT&quot; needs flit_core &gt;=3.11, and import-names needs flit_core &gt;=4. The Flit docs also ask every package to pin &quot;&lt;5&quot;.</p>
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+ <h3>What the checker does</h3>
684
+ <p>Flit Migration Check is a VS Code extension with a free web version that runs the same engine. Open setup.py, setup.cfg or pyproject.toml and it prints one finding per line: the line number, what the line is, and the flit_core 4 line that replaces it. It has 38 rules, and each one names its source page on flit.pypa.io.</p>
685
+ <p>The bundled sample setup.py gives 22 findings on 22 lines (10 warnings, 12 notes, 0 blockers). A finished flit_core 4 pyproject.toml gives 0 findings, which is the point where you delete setup.py.</p>
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+ <p>Three pyproject.toml cases show how the answer changes with the input:</p>
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+ <ul><li>An old Flit 3 file with [tool.flit.metadata], [tool.flit.scripts] and &quot;flit_core &gt;=3.2&quot;: 3 findings. The metadata table, the scripts table, and the missing &lt;5 bound.</li><li>A Hatch file with hatchling, dynamic = [&quot;version&quot;, &quot;dependencies&quot;] and [project.entry-points.console_scripts]: 5 findings. Flit fills only version, description, import-names and import-namespaces from dynamic, and console_scripts belongs in [project.scripts].</li><li>A Flit 3.x file pinned &quot;flit_core &gt;=3.2,&lt;4&quot; with license = &quot;Apache-2.0 WITH LLVM-exception&quot;: 3 findings. The &lt;4 pin can become &lt;5, and the WITH license needs flit_core &gt;=4.1.</li></ul>
688
+ <h3>Blockers: when not to use Flit</h3>
689
+ <p>Flit builds pure Python only: &quot;If your package needs a build step, you won&#x27;t be able to use Flit&quot;. The checker marks ext_modules, Extension(, cythonize( and custom cmdclass as BLOCKER lines. Version from git tags (setuptools_scm, versioneer) is also a blocker: write the version into the package and add dynamic = [&quot;version&quot;].</p>
690
+ <h3>Before twine upload</h3>
691
+ <p>PyPI rejects an upload file over 100.0 MiB by default, and it refuses invalid Trove classifiers and a name too close to an existing project. The classifiers rule reminds you that &quot;Private :: Do Not Upload&quot; blocks an accidental upload.</p>
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+ <h3>Free and paid</h3>
693
+ <p>The single-file map is free with no limit. A workspace key turns every setup.py, setup.cfg and pyproject.toml in the workspace into one dated migration plan. A team key adds an exposure report across projects and a CI gate that fails a build adding new setuptools-only use.</p></div><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:30px 0 10px;color:#1b1f24">15 seconds — what it actually does</h2><video controls muted playsinline preload="none" poster="/img/promo/sku428290_result_card.jpg" style="width:100%;max-width:360px;border-radius:10px;display:block;margin:0 auto"><source src="/media/sku428290_short.mp4" type="video/mp4"></video><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:34px 0 6px;color:#1b1f24">Questions people ask</h2><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does Flit Migration Check do?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">It reads the open setup.py, setup.cfg or pyproject.toml in VS Code and lists every line that still belongs to setuptools, Hatch, Poetry or the old Flit 3 layout, with its line number and the exact flit_core 4 line that replaces it. Compiled extensions and custom cmdclass are marked BLOCKER because Flit builds pure Python only. It has 38 rules.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Who is Flit Migration Check for?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">Python library maintainers moving a pure-Python package from setup.py or setuptools to Flit, teams whose Flit 3 packages still use [tool.flit.metadata], and anyone switching from Hatch or Poetry to flit_core. flit_core 4.0 (on PyPI 2026-08-04) no longer reads [tool.flit.metadata], so an unpinned old-layout package no longer builds from its sdist.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">Why not just ask a chatbot or read the Flit docs?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">The docs are free and correct, but you must map each setup() argument yourself. A chatbot&#x27;s packaging advice from before August 2026 cannot know that flit_core 4.0 (on PyPI 2026-08-04) no longer reads [tool.flit.metadata], or that flit_core 4.1 (on PyPI 2026-09-16) accepts license expressions with WITH. The checker reads your actual file line by line, offline, and quotes the flit docs for each replacement.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What is free and what needs a key?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">The single-file map is free with no limit: every finding, line number and replacement line; the bundled sample setup.py gives 22 findings on 22 lines (10 warnings, 12 notes, 0 blockers). A $29 workspace key adds one dated migration plan across every setup.py, setup.cfg and pyproject.toml. A $149 team key adds the cross-project exposure report and a CI gate that fails a build adding new setuptools-only use.</p></details><details style="border-bottom:1px solid #e6e9ed;padding:10px 0"><summary style="cursor:pointer;font:600 15px/1.4 system-ui,sans-serif;color:#1b1f24">What does it cost compared with doing it by hand?</summary><p style="margin:8px 0 2px;font:400 14.5px/1.6 system-ui,sans-serif;color:#33404b">By hand you read three flit.pypa.io pages and translate each setup() argument, then learn about a wrong flit_core bound when the sdist build fails. The free map does the translation per file. The workspace key is $29 once, one licence key per person or team seat, and it is not a subscription.</p></details><script type="application/ld+json" data-yj="yj-faq-ld">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What does Flit Migration Check do?", "acceptedAnswer": {"@type": "Answer", "text": "It reads the open setup.py, setup.cfg or pyproject.toml in VS Code and lists every line that still belongs to setuptools, Hatch, Poetry or the old Flit 3 layout, with its line number and the exact flit_core 4 line that replaces it. Compiled extensions and custom cmdclass are marked BLOCKER because Flit builds pure Python only. 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The workspace key is $29 once, one licence key per person or team seat, and it is not a subscription."}}]}</script><div id="yj-ask" style="margin:36px 0 0;padding:18px 18px 16px;border:1px solid #e2e6ea;border-radius:10px;background:#fbfbfc"><h2 style="font:600 19px/1.3 system-ui,sans-serif;margin:0 0 4px;color:#1b1f24">Ask about this tool</h2><p style="font:400 13.5px/1.5 system-ui,sans-serif;margin:0 0 12px;color:#5b6570">One question, answered by the person who built it. Your email only if you want the answer sent.</p><form onsubmit="return yjAsk(event)" style="display:grid;gap:8px"><textarea name="question" required minlength="10" maxlength="2000" rows="3" placeholder="Your question" style="font:14px/1.5 system-ui,sans-serif;padding:10px;border:1px solid #cfd6dd;border-radius:6px"></textarea><div style="display:flex;gap:8px;flex-wrap:wrap"><input type="email" name="email" placeholder="Email (optional)" style="flex:1;min-width:200px;font:14px system-ui,sans-serif;padding:9px 10px;border:1px solid #cfd6dd;border-radius:6px"><button type="submit" style="font:600 14px system-ui,sans-serif;padding:9px 18px;border:0;border-radius:6px;background:#1b1f24;color:#fff;cursor:pointer">Send</button></div><p id="yj-ask-msg" style="font:13px system-ui,sans-serif;margin:2px 0 0;color:#0a6238;min-height:1em"></p></form><script>function yjAsk(e){e.preventDefault();var f=e.target,m=document.getElementById("yj-ask-msg");m.style.color="#0a6238";fetch(location.origin+"/api/ask",{method:"POST",headers:{"Content-Type":"application/json"},body:JSON.stringify({sku:428290,slug:"flit-migration-check",lang:"en",question:f.question.value,email:f.email.value,page:location.pathname})}).then(function(r){if(!r.ok)throw 0;m.textContent="Thanks \u2014 noted. Answers land on this page and, if you left an email, in your inbox.";f.question.value="";}).catch(function(){m.style.color="#a8551f";m.textContent="Could not send. Please try again in a minute.";});return false;}</script></div></section><section class="yj-related" style="max-width:920px;margin:56px auto 40px;padding:0 20px"><h2 style="font:600 21px/1.3 system-ui,sans-serif;margin:0 0 6px;color:#1b1f24">Same job, next tool</h2><p style="font:400 14.5px/1.5 system-ui,sans-serif;margin:0 0 20px;color:#5b6570">Free in the browser. The full version is a one-time licence.</p><div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px"><a class="yj-rel-c" href="https://getreadystack.com/tools/spdx-license-field-lint"><span class="yj-rel-t">SPDX License Field Lint for package.json, pyproject.toml and Cargo.toml</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/personal-data-map-dsar-audit"><span class="yj-rel-t">Personal Data Map: find every column a GDPR subject access request has to reac</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/pyproject-release-gate"><span class="yj-rel-t">pyproject.toml Release Gate (PEP 639)</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/revit-door-families"><span class="yj-rel-t">Revit Door Families - UK Door Block Library in mm: 14 doors on standard 838 x </span><span class="yj-rel-p">$100</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/almalinux-migration-lint"><span class="yj-rel-t">AlmaLinux Migration Lint — CentOS 7/8</span><span class="yj-rel-p">$29</span></a><a class="yj-rel-c" href="https://getreadystack.com/tools/autohotkey-toml-devicetree-snippets"><span class="yj-rel-t">AutoHotkey v2, TOML and DeviceTree checks for VS Code</span><span class="yj-rel-p">$29</span></a></div><style>.yj-rel-c{display:flex;flex-direction:column;gap:8px;padding:15px 16px;border:1px solid #e2e6ea;border-radius:6px;text-decoration:none;background:#fff}.yj-rel-c:hover{border-color:#b9c2cb;background:#fafbfc}.yj-rel-t{font:500 14.5px/1.42 system-ui,sans-serif;color:#1b1f24}.yj-rel-p{font:600 13px system-ui,sans-serif;color:#0a6238}</style></section></body>
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