Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

I think it would help if we could enable some future feature globally by 
command line option or environment variable, without modifying all source 
files. It would allow users to quickly test their code base for compatibility 
with future changes. The problem currently is that nobody bothers to add "from 
__future__ import ...", so we have surprises every time when try to make it by 
default.

A tool which automatically adds or removes "from __future__ import ..." in 
files could help too.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38605>
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