problem description:

when I was working on the actual combat article of Liao Xuefeng, I had a question when operating the database. I first defined two co-programs, and then defined a main co-program await to execute the two co-programs sequentially. (I think.), was executed sequentially and the log was printed, and it was found that it was not the result I expected.

python version: 3.6.4

the complete code is as follows:

   
 (Note: actually the order is not certain, sometimes 1 is in the first column) 

  my doubts:  
  await  is not  yield from ? That is, give control to the main loop, so shouldn"t I have more than one  await  in the same loop to execute sequentially? So according to reason, shouldn"t 1 be displayed in the first column?