Problem: pip install skillspector fails — "No matching distribution" (it's not on PyPI) —— Trove problem library

What you will run into

pip install skillspector==2.10.0 fails with Could not find a version that satisfies the requirement ... (from versions: none) and No matching distribution found.

You think the mirror is broken; switching to Tsinghua or the official source gives the same result — because this package simply isn't on PyPI.

Why this happens

skillspector's distribution channel is GitHub Release (wheel + sdist assets), not PyPI. Installing it the PyPI way is guaranteed to fail; this is the most common pitfall in CN tutorials (some tutorials write pip install git+... as a workaround).

pip install <name> is channel addressing: pip queries the index you configured (PyPI by default) by name, and if the name doesn't exist on PyPI it reports "could not find a version".

The key is that channels aren't global — a project may choose to publish only on GitHub Release, and pip doesn't know that channel by default.

So "switching mirrors doesn't help" is inevitable: Tsinghua, official and Aliyun are all PyPI mirrors — mirrors of the same channel; what's absent from the channel is absent from every mirror.

The right move is switching channels, not mirrors: download the wheel from GitHub Release, then pip install <file> — now pip isn't addressing by name, it installs a local file directly, while dependencies still come from PyPI (which is why you configure a CN mirror for them).

This mechanism also explains three phenomena: pip install git+... works (pip supports installing from the git channel); the wheel filename must not be renamed (pip parses name/version/platform from the filename and rejects bad formats);

and (from versions: none) — "none" means "the channel has zero versions", the signature of a channel problem.

Step by step

1. Confirm the channel — Required

pip index versions skillspector reporting "No matching distribution" = not on PyPI; stop trying PyPI.

2. Download the release wheel — Required

curl -sL -o skillspector-2.10.0-py3-none-any.whl https://gh-proxy.com/https://github.com/NVIDIA/SkillSpector/releases/download/v2.10.0/skillspector-2.10.0-py3-none-any.whl

gh-proxy accelerates from CN; a must when direct GitHub is unstable.

3. pip install the wheel — Required

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple skillspector-2.10.0-py3-none-any.whl

Dependencies via the Tsinghua mirror; the wheel itself comes from GitHub Release.

4. Verify the command surface — Required

skillspector --version

Expected output SkillSpector v2.10.0 (measured).

How to confirm it works

Version command outputs correctly (measured output):

skillspector --version
→ SkillSpector v2.10.0

Install log ends with install exit=0 (measured closure: 468K wheel download → all deps installed).

Other environments

Symptom

pip install skillspector==2.10.0 reports:

ERROR: Could not find a version that satisfies the requirement skillspector==2.10.0 (from versions: none)
ERROR: No matching distribution found for skillspector==2.10.0

Cause

skillspector is not on PyPI — its distribution channel is GitHub Release (wheel + sdist assets). Installing the PyPI way always fails; this is the most common pitfall in domestic tutorials (some tutorials write pip install git+... as a workaround).

Solution

1. Correct approach (verified in this marketplace): download the release wheel then pip install:

   curl -sL -o skillspector-2.10.0-py3-none-any.whl https://gh-proxy.com/https://github.com/NVIDIA/SkillSpector/releases/download/v2.10.0/skillspector-2.10.0-py3-none-any.whl
   pip install -i https://pypi.tuna.tsinghua.edu.cn/simple skillspector-2.10.0-py3-none-any.whl

1. Note: keep the wheel filename exactly as-is (pip validates the filename format; shortening it reports Invalid wheel filename).
2. Or pip install git+https://github.com/NVIDIA/SkillSpector.git (source mode; domestic direct unstable).