Feb. 17, 2017
7:39 p.m.
On Fri, Feb 17, 2017 at 1:55 PM, Joshua Morton <joshua.morton13@gmail.com> wrote:
but I'm wondering how common async and await were when that was proposed and accepted?
Actually, "async" and "await" are backwards compatible due to a clever tokenizer hack. The "async" keyword may only appear in a few places (e.g. async def), and it is treated as a name anywhere else.The "await" keyword may only appear inside an "async def" and is treated as a name everywhere else. Therefore... >>> async = 1 >>> await = 1 ...these are both valid in Python 3.5. This example is helpful when proposing new keywords. More info: https://www.python.org/dev/peps/pep-0492/#transition-plan