January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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asyncio 模組（僅限 v3）
|
597
• 沒有方法
af.running()
為了執行緒安全性，只要
af
一完成，以
af.add_done_callback
新增的
callbacks 就會被排程，藉由
loop.call_soon_threadsafe
。
af
還提供了三個額外的方法：
remove_done_callback remove_done_callback(func)
從
af
的 callbacks 所成的串列移除
func
的所有實體；回傳它移
除的實體數。
set_exception set_exception(exception)
將
af
標示為完成，並將它的例外設為
exception
。如果
af
已經
完成，
set_exception
會提出一個例外。
set_result set_result(value)
將
af
標示為完成，並將它的結果設為
value
。如果
af
已經完
成，
set_result
會提出一個例外。
（事實上，
cf
也有方法
set_exception
和
set_result
，但在
cf
的情況中，
它們完全只能由單元測試和
Executor
實作來呼叫的；
af
相同的方法則沒有
這種限制。）
在
asyncio
中建立一個
Future
的最佳方式是使用
loop
的
create_future
方
法，它不接受引數；最糟情況下，
loop.create_future()
只會進行與
return
futures.Future(loop)
完全相同的事情，但，藉由這種方式，替代的迴圈實
作就有機會覆寫該方法並提供更好的 futures ...
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