astral-sh/uv · error · anyhow::Error

Received multiple Python version requests: `{}` and `{}`

Error message

Received multiple Python version requests: `{}` and `{}`

What it means

Error "Received multiple Python version requests: `{}` and `{}`" thrown in astral-sh/uv.

Source

Thrown at crates/uv/src/commands/tool/run.rs:720

            target: Target::Unspecified(requirement),
            ..
        } => Some(RequirementsSpecification::parse_package(requirement)?),
        _ => None,
    };

    // Determine explicit Python version requests
    let explicit_python_request = python.map(PythonRequest::parse);
    let tool_python_request = match request {
        ToolRequest::Python { request, .. } => Some(request.clone()),
        ToolRequest::Package { .. } => None,
    };

    // Resolve an argument-derived Python request, if any.
    let python_request = match (explicit_python_request, tool_python_request) {
        // e.g., `uvx --python 3.10 python3.12`
        (Some(explicit), Some(tool_request)) if tool_request != PythonRequest::Default => {
            // Conflict: both --python flag and versioned tool name
            return Err(anyhow::anyhow!(
                "Received multiple Python version requests: `{}` and `{}`",
                explicit.to_canonical_string().cyan(),
                tool_request.to_canonical_string().cyan()
            )
            .into());
        }
        // e.g, `uvx --python 3.10 ...`
        (Some(explicit), _) => Some(explicit),
        // e.g., `uvx python` or `uvx <tool>`
        (None, Some(PythonRequest::Default) | None) => None,
        // e.g., `uvx python3.12`
        (None, Some(tool_request)) => Some(tool_request),
    };
    let python_request = ToolPython::from_request(
        python_request,
        unresolved_target_requirement
            .as_ref()
            .map(|requirement| &requirement.requirement),

View on GitHub (pinned to f1a42680ff)

When it happens

Trigger: Thrown at crates/uv/src/commands/tool/run.rs:720 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/72013504cf481845. Report an issue: GitHub.