Semver isn&#x27;t all that OLD; it came out in 2009, I think? (The SemVer site very helpfully doesn&#x27;t have any dates on it.) Python, meanwhile, came out in 1991. Not having precognition made it difficult for Python to adopt SemVer, and now that they have versioning practices in place there needs to be more than &quot;I like SemVer&quot; as a compelling argument for them to change. Especially since there are reasonable people who have reasonable disagreements with how SemVer works.