zed-industries/zed · error

pylsp-mypy installation failed

Error message

pylsp-mypy installation failed

What it means

The follow-up pip install of pylsp-mypy into the managed venv failed with a non-success status, after python-lsp-server itself installed. Same failure class as other pip installs: network, resolution, or environment issues.

Source

Thrown at crates/languages/src/python.rs:2004

        delegate: &Arc<dyn LspAdapterDelegate>,
    ) -> impl Send + Future<Output = Result<LanguageServerBinary>> + use<> {
        let delegate = delegate.clone();

        async move {
            let venv = Self::ensure_venv(delegate.as_ref()).await?;
            let pip_path = venv.join(BINARY_DIR).join("pip3");
            ensure!(
                util::command::new_command(pip_path.as_path())
                    .arg("install")
                    .arg("python-lsp-server[all]")
                    .arg("--upgrade")
                    .output()
                    .await?
                    .status
                    .success(),
                "python-lsp-server[all] installation failed"
            );
            ensure!(
                util::command::new_command(pip_path)
                    .arg("install")
                    .arg("pylsp-mypy")
                    .arg("--upgrade")
                    .output()
                    .await?
                    .status
                    .success(),
                "pylsp-mypy installation failed"
            );
            let pylsp = venv.join(BINARY_DIR).join("pylsp");
            ensure!(
                delegate.which(pylsp.as_os_str()).await.is_some(),
                "pylsp installation was incomplete"
            );
            Ok(LanguageServerBinary {
                path: pylsp,
                env: None,

View on GitHub (pinned to f4178619ac)

Solutions

1. Retry the install; transient PyPI/network failures are common
2. Install pylsp-mypy manually in the venv to inspect the underlying pip error

When it happens

Trigger: Thrown at crates/languages/src/python.rs:2004 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/5d5d3006620bd0a1. Report an issue: GitHub.