It's a good assumption for 3.7. In isolation this is a pragmatic decision and makes sense. You are correct though. A .py file which uses non-ascii and doesn'

It's a good assumption for 3.7. In isolation this is a pragmatic decision and makes sense. You are correct though. A .py file which uses non-ascii and doesn't declare the encoding should be considered an error though. Hopefully everybody's dev tools will pick this up (even on 3.7 where they wouldn't need to)