My e-commerce catalogue has grown to roughly five million product pages and I need a Python-based workflow that can: • Stream-generate standards-compliant XML sitemaps, split and indexed so every URL is covered without breaching the 50 000-URL/50 MB limits. • Automatically ping Google, Bing and Yahoo once the files are in place, making use of the Search Console and Bing Webmaster APIs where possible. • Run from the command line (or a simple cron) and finish with a short log that confirms file locations and submission status. Please structure the code so it writes each URL sequentially to disk rather than keeping the full set in memory, add lastmod timestamps pulled from our database (or a stub I can swap in later), and include optional gzip compression. Deliverables 1. Well-documented Python script(s) and any requirements.txt. 2. Initial full sitemap set plus sitemap index that validates at https://www.google.com/webmasters/tools/sitemap-list. 3. Submission routine and a brief read-me showing the commands/API calls you used. 4. Screenshot or console log showing successful submission to Google, Bing and Yahoo. I will supply URL patterns and a test server; you return code that I can drop onto production and rerun whenever the catalogue changes.