Python多处理错误:AttributeError:模块'__main__'没有属性'__spec__'

Python Multiprocessing error: AttributeError: module #39;__main__#39; has no attribute #39;__spec__#39;(Python多处理错误:AttributeError:模块__main__没有属性__spec__)

问题描述

我正在使用 Python 3.6，并尝试遵循下面网站上的第一个示例(完整代码也在下面)并且收到以下错误:https://docs.python.org/3.6/library/multiprocessing.html

I'm using Python 3.6 and am trying to follow along with the very first example at the website below (full code also below) and am getting the below error: https://docs.python.org/3.6/library/multiprocessing.html

错误信息:AttributeError: 模块 '__main__' 没有属性 '__spec__'

完整示例代码:

from multiprocessing import Pool

def f(x):
    return x*x

if __name__ == '__main__':
    with Pool(5) as p:
        print(p.map(f, [1, 2, 3]))

我尝试用谷歌搜索它并搜索 Stack Overflow，但我只发现了另一种这种错误的情况，它没有答案.

I tried Googling it and searching Stack Overflow but I've only found one other case of this error and it did not have an answer.

推荐答案

问题不在于代码/Python 3.6，而在于 Spyder.

The problem is not with the code / Python 3.6, it is with Spyder.

经过一番调查，我发现代码在外部系统终端中执行时运行良好，但在 Spyder 的 IPython 控制台中运行时却不行.

After some investigation I found that the code runs fine when executed in an external system terminal but not when run in Spyder's IPython console.

我能够转储 spec 的内容并将它们分配给包含在 ma​​in 中的变量，以允许此代码在 IPython 控制台中运行.

I was able to dump the contents of spec and assign them to a variable that was included inside main to allow this code to function within the IPython console.

from multiprocessing import Pool

def f(x):
    return x*x

if __name__ == '__main__':
    __spec__ = "ModuleSpec(name='builtins', loader=<class '_frozen_importlib.BuiltinImporter'>)"
    with Pool(5) as p:
       print (p.map(f, [1, 2, 3]))

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