如何使 `concurrent.futures.ProcessPoolExecutor().map` 与 kwonly args 一起工作？

Question

如何使concurrent.futures.ProcessPoolExecutor().map使用 kwonly args？ 这可能吗？

使用位置参数：

def worker_function(x):
    # Return the square of the passed argument:
    return x ** 2

# concurrent.futures example:
from concurrent.futures import ProcessPoolExecutor
with ProcessPoolExecutor() as executor:
    squares = list(executor.map(worker_function, (1, 2, 3, 4, 5, 6)))

如何使此工作适用于 function 仅接受关键字参数：

def worker_function(*, x):
    # Return the square of the passed argument:
    return x ** 2

我试过这个

with ProcessPoolExecutor() as executor:
    squares = list(executor.map(worker_function, (dict(x=x) for x in (1, 2))))

失败是因为 dict 由于某种原因没有作为 kwargs 传递

TypeError: worker_function() takes 0 positional arguments but 1 was given

Answer 1

好的，这样的事情似乎有效：

with ProcessPoolExecutor() as executor:
    # Using lambda, unpacks the dict (**f) into hello(**kwargs)
    kwargs_names = (dict(x=x, y=2) for x in range(4))
    executor.map(lambda f: worker_function(**f), kwargs_names)

print(squares)

参考