On 06/26/2015 10:31 AM, Chris Angelico wrote:
Apologies if this is a really REALLY dumb question, but... How hard would it be to then dispense with the await keyword, and simply _always_ behave that way? Something like:
def data_from_socket(): # Other tasks may run while we wait for data # The socket.read() function has yield points in it data = socket.read(1024, 1) return transmogrify(data)
def respond_to_socket(): while True: data = data_from_socket() # We can pretend that socket writes happen instantly, # but if ever we can't write, it'll let other tasks wait while # we're blocked on it. socket.write("Got it, next please!")
Do these functions really need to be aware that there are yield points in what they're calling?
I think "yield points" is a concept that needs to be spelled out a bit clearer in the PEP 492.
It seems that those points are defined by other means outside of a function defined with "async def". From the PEP...
* It is a SyntaxError to have yield or yield from expressions in an async function.
So somewhere in an async function, it needs to "await something" with a yield in it that isn't an async function.
This seems to be a bit counter intuitive to me. Or am I missing something?