How to Audit hreflang Tags Across a Sitemap with Python's Standard Library

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Hreflang annotations tell Google which pages are regional or language versions of each other, so each searcher sees the right one, but errors are easy to make and hard to spot in a browser. A new tutorial shows how to build a Python auditor using only the standard library that reads a sitemap, collects hreflang from sitemap entries, HTML and HTTP headers, and fetches every page and alternate. The script checks for missing return links, self-references, invalid language or region codes, x-default usage, relative URLs and broken alternates. Its output is a CSV and console summary, with an exit code suited to CI pipelines. The article is published by Appie.run, which also offers free tools mentioned in the piece, though the script does not depend on them. The guidance draws on Google Search Central documentation last updated in September 2026.

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