zed-industries/zed · error

python-lsp-server[all] installation failed

Error message

python-lsp-server[all] installation failed

What it means

Raised in the python-lsp-server adapter when the `pip install python-lsp-server[all]` step inside the managed venv fails (the pip3 command exited non-zero). The language server binary was never installed, so fetch_server_binary aborts and the LSP cannot start.

Source

Thrown at crates/languages/src/python.rs:1993

        _: &Arc<dyn LspAdapterDelegate>,
        _: bool,
        _: &mut AsyncApp,
    ) -> Result<()> {
        Ok(())
    }

    fn fetch_server_binary(
        &self,
        _: (),
        _: PathBuf,
        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

View on GitHub (pinned to f4178619ac)

Solutions

1. Retry the language server install after checking network connectivity
2. Run 'pip3 install python-lsp-server[all] --upgrade' manually in the Zed venv to see the pip error
3. Ensure Python/venv prerequisites and pip are available and up to date

When it happens

Trigger: Thrown at crates/languages/src/python.rs:1993 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/4b80a67132fbcbaf. Report an issue: GitHub.