小编典典

Python Multiprocessing-如何将kwargs传递给函数?

python

如何使用Python的Multiprocessing将字典传递给函数?文档:https
:
//docs.python.org/3.4/library/multiprocessing.html#reference说要通过字典,但是我一直在

TypeError: fp() got multiple values for argument 'what'

这是代码:

from multiprocessing import Process, Manager

def fp(name, numList=None, what='no'):
        print ('hello %s %s'% (name, what))
        numList.append(name+'44')

if __name__ == '__main__':

    manager = Manager()

    numList = manager.list()
    for i in range(10):
        keywords = {'what':'yes'}
        p = Process(target=fp, args=('bob'+str(i)), kwargs={'what':'yes'})
        p.start()
        print("Start done")
        p.join()
        print("Join done")
    print (numList)

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2020-12-20

共1个答案

小编典典

当我运行您的代码时,出现了另一个错误:

TypeError: fp() takes at most 3 arguments (5 given)

我通过打印args和kwargs并将方法更改为进行调试,fp(*args, **kwargs)并注意到“
bob_”作为字母数组传入。似乎括号args是可操作的,实际上并没有给您元组。将其更改为列表,然后还numList作为关键字参数传入,使代码对我有用。

from multiprocessing import Process, Manager

def fp(name, numList=None, what='no'):
    print ('hello %s %s' % (name, what))
    numList.append(name+'44')

if __name__ == '__main__':

    manager = Manager()

    numList = manager.list()
    for i in range(10):
        keywords = {'what': 'yes', 'numList': numList}
        p = Process(target=fp, args=['bob'+str(i)], kwargs=keywords)
        p.start()
        print("Start done")
        p.join()
        print("Join done")
    print (numList)
2020-12-20