On 2018-05-31 16:35, Erik Bray wrote:
Perhaps you could clarify something: I tried suggesting a while ago that Sage start using language_level=3 at least when actually building Sage on Python 3. I know this isn't necessary but it just seemed to make logical sense. But Jeroen was convinced it wasn't necessary because, according to him, language_level=3 doesn't really do anything.
For the record, the thing that I objected most to was changing it *only* on Python 3. For best portability, you should use either language_level=2 or language_level=3 (as opposed to making the language_level depend on the Python version that you are targetting).
language_level=3 enables all __future__ imports for Python 3 (like unicode_literals) and it changes the parser to be like Python 3 (this impacts exec for example). So it does affect stuff, but not so much beyond what you can get with __future__ imports.
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