Message 305549 - Python tracker
According to PEP 492, async and await should have been deprecated in 3.5 and 3.6, but I don't think they have been : await = 1 def f(async=True): ... don't raise any deprecation warning in 3.6. Since version 3.7 will break existing code with a SyntaxError, could it be possible to have something explicit in the SyntaxError message for these new keywords, for instance SyntaxError : 'async' is a keyword I don't speack C so I can't provide a patch, sorry.