`pylock.toml` is not a supported input format for `uv pip co

Error message

`pylock.toml` is not a supported input format for `uv pip compile`

What it means

Error "`pylock.toml` is not a supported input format for `uv pip compile`" thrown in astral-sh/uv.

Source

Thrown at crates/uv/src/commands/pip/compile.rs:234

        require_hashes: _,
        find_links,
        no_binary,
        no_build,
    } = RequirementsSpecification::from_sources(
        requirements,
        constraints,
        overrides,
        excludes,
        Some(&groups),
        &client_builder,
    )
    .await?;

    override_dependencies.extend(overrides_from_workspace);

    // Reject `pylock.toml` files, which are valid outputs but not inputs.
    if pylock.is_some() {
        return Err(anyhow!(
            "`pylock.toml` is not a supported input format for `uv pip compile`"
        ));
    }

    let constraints = constraints
        .iter()
        .cloned()
        .chain(
            constraints_from_workspace
                .into_iter()
                .map(NameRequirementSpecification::from),
        )
        .collect();

    let excludes: Vec<ExcludeDependency> = excludes
        .into_iter()
        .chain(excludes_from_workspace)
        .collect();

View on GitHub (pinned to f1a42680ff)

When it happens

Trigger: Thrown at crates/uv/src/commands/pip/compile.rs:234 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astral-sh/uv@f1a42680ff (2026-08-16). Data as JSON: /api/errors/46ba112e88d3cde5. Report an issue: GitHub.