小菜鸡请教 concurrent.futures.ThreadPoolExecutor 的问题 - V2EX
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ohayoo

小菜鸡请教 concurrent.futures.ThreadPoolExecutor 的问题

  •  
  •   ohayoo Feb 7, 2023 2534 views
    This topic created in 1194 days ago, the information mentioned may be changed or developed.

    各位大佬,python 的 concurrent.futures.ThreadPoolExecutor 下的 map 返回值是按提交顺序来的吗?

    我之前一直以为用 map 的话 返回值是按提交的顺序来的,但今天看 map 对应的代码,注释是这样写的

    Returns: An iterator equivalent to: map(func, *iterables) but the calls may be evaluated out-of-order.

    这个意思是可能会乱序,并不能保证顺序返回吗?

    如果 map 不能保证顺序返回, 但多线程的时候又希望按顺序返回,该怎么办呢?还望大佬们赐教

    6 replies    2023-02-20 13:42:07 +08:00
    echoless
        1
    echoless  
       Feb 7, 2023   1
    https://pymotw.com/3/concurrent.futures/

    map 会保证结果是 in order 的, 虽然 func 执行可能 out of order
    wuwukai007
        2
    wuwukai007  
       Feb 7, 2023   1
    jobs = [pool.submit(fn,i) for i in range(10)]
    [i.result() for i in jobs]
    ClericPy
        3
    ClericPy  
       Feb 7, 2023   1
    结果不乱, 执行乱
    julyclyde
        4
    julyclyde  
       Feb 8, 2023
    如果你希望按顺序返回
    那是你的需求有问题
    chr666
        5
    chr666  
       Feb 20, 2023
    传个 id 进去,最后返回时候排个序不就行了
    ohayoo
        6
    ohayoo  
    OP
       Feb 20, 2023
    @chr666 嗯嗯, 这个已经搞定了
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