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koobs authored
Make it clear that <version-spec> is a declarative not imperative specification to declare what version of Python a port or software *supports*, not the versions it should *use*. The version that gets selected is a function of Python.mk, DEFAULT_VERSIONS which change over time, and can be overridden or otherwise set by the user. While I'm here, add a special note about bare USES=python (without a <version-spec>), which is likely to be deprecated at some point down the line. In the meantime, describe what the semantics of not specifying a <version-spec> entails, and encourage minimisation of its use where appropriate. Approved by: koobs (python, maintainer)
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