Fix Python sidebar table of contents links are missing

fix-python-sidebar-toc.user.js

// ==UserScript==
// @name         Python doc fix sidebar links
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Fix Python documentation sidebar table of contents to include header links
// @author       rigwild
// @match        https://docs.python.org/*/library/*.html*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=python.org
// @grant        none
// ==/UserScript==

;(function () {
  'use strict'

  const sidebarMenuUl = document.querySelector('.sphinxsidebar ul ul')
  const headerLinks = [...document.querySelectorAll('.headerlink')]

  if (!sidebarMenuUl || headerLinks.length === 0) return

  const createLink = (href, text) => {
    const listItem = document.createElement('li')
    listItem.innerHTML = `<a class="reference internal" href="${href}"><code class="xref py py-class docutils literal notranslate"><span class="pre">${text}</span></code></a>`
    return listItem
  }

  sidebarMenuUl.appendChild(createLink('#', '')) // Spacer at the top
  headerLinks.forEach(link => {
    const href = link.getAttribute('href')
    const ref = href?.split('#')[1]
    if (href) {
      const listItem = createLink(href, ref)
      sidebarMenuUl.appendChild(listItem)
    }
  })
})()