Python 2.6 Win32(xp)上的Python多处理

问题描述

我试图从jesse noller的这个Multiprocessing讲座中复制这个示例(如另一篇SO文章所推荐)[ http://pycon.blip.tv/file/1947354?filename=Pycon-IntroductionToMultiprocessingInPython630.mp4]

I tried to copy this example from this Multiprocessing lecture by jesse noller (as recommended in another SO post)[http://pycon.blip.tv/file/1947354?filename=Pycon-IntroductionToMultiprocessingInPython630.mp4]

但是由于某种原因，我遇到了一个错误，好像它忽略了我的函数定义:我使用的是Windows XP(win32)，我知道它对2.6中的多处理库有限制，要求所有内容都是可腌制的

But for some reason I'm getting an error, as though it's ignoring my function definitions:I'm on Windows XP (win32) which I know has restrictions with regards to the multiprocessing library in 2.6 that requires everything be pickleable

from multiprocessing import Process
import time

def sleeper(wait):
    print 'Sleeping for %d seconds' % (wait,)
    time.sleep(wait)
    print 'Sleeping complete'

def doIT():
    p = Process(target=sleeper, args=(9,))
    p.start()
    time.sleep(5)
    p.join()

if __name__ == '__main__':
    doIT()

输出:

Evaluating mypikklez.py
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Python26\lib\multiprocessing\forking.py", line 342, in main
    self = load(from_parent)
  File "C:\Python26\lib\pickle.py", line 1370, in load
    return Unpickler(file).load()
  File "C:\Python26\lib\pickle.py", line 858, in load
    dispatch[key](self)
  File "C:\Python26\lib\pickle.py", line 1090, in load_global
    klass = self.find_class(module, name)
  File "C:\Python26\lib\pickle.py", line 1126, in find_class
    klass = getattr(mod, name)
AttributeError: 'module' object has no attribute 'sleeper'

导致该问题的错误是:AttributeError:'模块'对象没有属性'sleeper'

The error causing the issue is : AttributeError: 'module' object has no attribute 'sleeper'

虽然功能如此简单，但我不明白会发生什么.

As simple of a function as it is I can't understand what would be the hold up.

这只是出于基本概念的自学目的.我并不是要预先优化任何现实世界中的问题.

This is just for self-teaching purposes of basic concepts. I'm not trying to pre-optimize any real world issue.

谢谢.

推荐答案

从追溯中看来，您正在直接将代码运行到python解释器(REPL)中.

Seems from the traceback that you are running the code directly into the python interpreter (REPL).

不要那样做.将代码保存在文件中，然后使用以下命令从文件中运行代码:

Don't do that. Save the code in a file and run it from the file instead, with the command:

python myfile.py

那将解决您的问题.

作为不相关的注释，此行是错误的:

As an unrelated note, this line is wrong:

print 'Sleeping for ' + wait + ' seconds'

应该是:

print 'Sleeping for %d seconds' % (wait,)

因为您无法连接字符串和int对象(python是强类型的)

Because you can't concatenate string and int objects (python is strongly typed)

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