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Uses/python.mk: Clarify language, messaging and usage for <version-spec>

Description

Uses/python.mk: Clarify language, messaging and usage for <version-spec>

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)

Details

Committed
koobsJul 3 2019, 7:31 AM
Parents
rP505729: www/palemoon: Reset maintainer
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