New option --python-version.

[matthiaskramm]

Store Python version as (major, minor) internally.
This is needed for #882 (and also #874).

[o11c]

I suggest you use mypy.syntax.dialect.Dialect from #880 instead. Of course, @JukkaL is inactive so making PRs is kind of pointless.

Instead of only a linear version, it computes the set of actual features, and can create variations. So, you would create one base version (e.g. Dialect(sys.version[:3])), and then from that create a version to allow stub-specific syntax in .pyi files but not .py files (currently just stub_dialect = dialect.add_future('mypy-codec') to allow annotations). Finally, as each file is parsed, it grows its own sub-dialect depending on the __future__ statements in effect.

[matthiaskramm]

Yes, your work in #880 looks highly relevant.
I primarily use pyversion to figure out which file to pull in, though. See the work in progress at matthiaskramm@bdaeea0 .
But of course applying the version to parsing is a secondary concern.

[o11c]

Note, #887 is cherry-picked from syntax, and also updated version to keep the patchlevel, and also support getting sys.path etc from an inferior.

[JukkaL]

This looks reasonable for now, and unblocks work on typeshed integration. #880 is probably some way off from being merged, it doesn't make sense to wait for that.

[o11c]

Note that I really am serious about #887 being ready even though #880 is not. It will almost certainly be needed for #732.