[Bug 205239] Mk/Uses/python.mk: USES=python:2 vs USES=python:-2.7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205239

            Bug ID: 205239
           Summary: Mk/Uses/python.mk: USES=python:2 vs USES=python:-2.7
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: vladimir.chukharev at gmail.com
                CC: freebsd-ports-bugs at FreeBSD.org, koobs at FreeBSD.org

Mk/Uses/python.mk has the following description:
#                       USES=python:2           # Use the Python 2 meta port

I understand this as 'use this if your port needs latest python of version
series 2.*'. A discussion in bug 205126 reveals that it means actually a need
for a symlink python2, while for latest v2 python it's better to use
USES=python:-2.7

It seems to me that the description is to be clarified.

Probably, suspicious usages of USES=python:2 are to be found and informed to
maintainers. I plan to do this change in all my ports as they are updated.

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