LykosAI/StabilityMatrix · error · FormatException

The 'Version' key was not found in the pip show output.

Error message

The 'Version' key was not found in the pip show output.

What it means

PipShowResult.Parse requires a 'Version' key in the pip show output after finding 'Name'. If a Version line is missing while Name is present, the output is malformed or truncated, and a FormatException is thrown.

Solutions

1. Ensure the full pip show stdout was captured (read all of StandardOutput before parsing)
2. Update/verify the pip version produces standard 'Name/Version/...' output
3. Fix the input fixture to include a 'Version:' line
4. Catch FormatException and treat the package metadata as invalid

Example fix

// before
// truncated fixture: "Name: numpy\nHome-page: ..."
// after
// fixture: "Name: numpy\nVersion: 1.26.0\nHome-page: ..."

if (!output.Contains("Version:"))
    throw new InvalidOperationException("pip show output truncated: Version line missing");

try
{
    var result = PipShowResult.Parse(output);
}
catch (FormatException ex)
{
    logger.LogWarning(ex, "pip show output missing Version key");
    return null;
}

When it happens

Trigger: Parsing pip show output whose lines stop after 'Name:' — truncated output, a modified/custom pip that omits Version, or hand-crafted metadata missing the Version line.

Common situations: Partially captured process output (buffer cut off), parsing pip variants (pip3, alternate distributors) with different output shapes, tests with incomplete fixture output.

Related errors

• The 'Name' key was not found in the pip show output.
• Expected opening brace.
• Fields line not found
• get-pip not found
• Install script failed with exit code

AI-assisted analysis of LykosAI/StabilityMatrix@af93d6ef57 (2026-09-12). Data as JSON: /api/errors/bac82469742a4569. Report an issue: GitHub.

Appendix: source

Thrown at StabilityMatrix.Core/Python/PipShowResult.cs:74

            var value = split[1].Trim();

            if (key == "Name" && linesDict.ContainsKey("Name"))
            {
                // We've hit a new package, so stop parsing
                break;
            }

            linesDict.TryAdd(key, value);
        }

        if (!linesDict.TryGetValue("Name", out var name))
        {
            throw new FormatException("The 'Name' key was not found in the pip show output.");
        }

        if (!linesDict.TryGetValue("Version", out var version))
        {
            throw new FormatException("The 'Version' key was not found in the pip show output.");
        }

        return new PipShowResult
        {
            Name = name,
            Version = version,
            Summary = linesDict.GetValueOrDefault("Summary"),
            HomePage = linesDict.GetValueOrDefault("Home-page"),
            Author = linesDict.GetValueOrDefault("Author"),
            AuthorEmail = linesDict.GetValueOrDefault("Author-email"),
            License = licenseText,
            Location = linesDict.GetValueOrDefault("Location"),
            Requires = linesDict
                .GetValueOrDefault("Requires")
                ?.Split(',', StringSplitOptions.TrimEntries)
                .ToList(),
            RequiredBy = linesDict
                .GetValueOrDefault("Required-by")

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