回答編集履歴
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経験則ですが`concurrent.futures`は高速化に適しているとは思いません。処理の内容や入出力の性質にもよりますが`asyncio`の方が適している気がします。
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# 追記
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```python
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from concurrent.futures import ThreadPoolExecutor as PoolExecutor
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from functools import partial
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from random import random
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from time import sleep
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def func1():
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fake_read = partial(input, "なんか入力してみてね。ちなみに空行で終了です。")
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yield from iter(fake_read, "")
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def func2(x):
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sleep(random())
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print("あなたが入力したのはこれね。", "->", x)
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def main():
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done = partial(print, "処理終わったよ。", "->")
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with PoolExecutor() as pool:
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for x in func1():
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f = pool.submit(func2, x)
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f.add_done_callback(done)
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if __name__ == '__main__':
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main()
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```
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