python ThreadPoolExecutor使用记录

ThreadPoolExecutor 是python的一个线程池模块
官方文档：https://docs.python.org/3/library/concurrent.futures.html

from concurrent.futures import ThreadPoolExecutor, as_completed
通过submit | map 均可将执行函数提交到线程池中，map返回的是有序的结果
max_workers 定义线程数

默认是cpu + 4，最大32，可自定义

submit方式：

with ThreadPoolExecutor(max_works=16) as executor:
    futures = {executor.submit(func, arg):arg for arg in args}
    for future in as_completed(futures):
        future.result()

map方式:

with ThreadPoolExecutor(max_works=16) as executor:
    futures = executor.map(func, args)
    for future in futures:
        print(future)

submit&map均可添加多个参数，map需要联合repeat使用

from itertools import repeat

with ThreadPoolExecutor(max_workers=16) as executor:
    futures = executor.map(func, args, repeat(arg1),repeat(arg2))
    for index, future in enumerate(futures):
        print(future)

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