Re: Await expressions

ram@zedat.fu-berlin.de (Stefan Ram) writes:

Heck, even of the respected members of this newsgroup, IIRC, no one
mentioned "__await__". So, let's give a big shoutout to Victor!

  It should be possible to understand "await" in isolation (in
  the spirit of the quotation I posted to "comp.lang.lisp" today.)
  For example, use "await" without using "asycnio". So here's
  an example program in that direction I just wrote.

  main.py

class o_class():
    def __await__( self ):
        print( "__await__ called." )
        return iter( [ 'a', 'b', 'c' ])

o = o_class()

async def f():
    while 1: await o

for i, j in enumerate( f().__await__() ):
    print( j )
    if 5 == i: break

  sys.stdout

__await__ called.
a
b
c
__await__ called.
a
b
c

  (Then, it should also be interesting to understand how asyncio
  uses "await" to implement asynchronous I/O.)