[Python-Dev] Importance of "async" keyword

[Sven R. Kunze]

Hi everybody,

recently, I stumbled over the new 3.5 release and in doing so over PEP 0492.

After careful consideration and after reading many blog posts of various 
coders, I first would like to thank Yury Selivanov and everybody else 
who brought PEP 0492 to its final state. I therefore considered usage 
within our projects, however, still find hazy items in PEP 0492. So, I 
would like to contribute my thoughts on this in order to either increase 
my understanding or even improve Python's async capability.

In order to do this, I need a clarification regarding the rationale 
behind the async keyword. The PEP rationalizes its introduction with:

"If useful() [...] would become a regular python function, [...] 
important() would be broken."


What bothers me is, why should important() be broken in that case?


Regards,
Sven R. Kunze