Unfortunately callback protocols don’t work well for type level
（四）收货人，是指有权提取货物的人。
。业内人士推荐PDF资料作为进阶阅读
This acceleration requires specifications: precise descriptions of what the software must do. As AI takes over implementation, specification becomes the core engineering discipline. Writing a specification forces clear thinking about what a system must do, what invariants it must maintain, what can go wrong. This is where the real engineering work has always lived. Implementation just used to be louder.
FT Edit: Access on iOS and web
asyncio.Condition lets consumers wait on arbitrary predicates: