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Add support for Python 3.14 - #13321
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Python 3.15.0 was released on 2026-10-09. Repositories that set requires-python = ">=3.15" currently fail in the updater with tool_version_not_supported, because 3.15 is missing from the list of pre-installed Python versions. This mirrors dependabot#13321 (the equivalent bump for 3.14): - add 3.15.0 to PRE_INSTALLED_PYTHON_VERSIONS_RAW - build it in python/Dockerfile and uv/Dockerfile, and make it the default pyenv global version - tar the previous default (3.14) like the other non-default versions - bump the ecosystem_versions spec to expect a max of 3.15 - point both READMEs at the file that actually holds the version list: language_version_manager.rb reads PRE_INSTALLED_PYTHON_VERSIONS but does not define it, language.rb defines it Blocked on docker-library/python#1134: docker.io/library/python:3.15.0-bookworm is not published yet, so the image build cannot succeed until it lands.
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What are you trying to accomplish?
Adds support for Python 3.14
Fixes #13274
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