问题
I have a function to be called from multiprocessing pool.map with multiple arguments.
from multiprocessing import Pool
import time
def printed(num,num2):
print 'here now '
return num
class A(object):
def __init__(self):
self.pool = Pool(8)
def callme(self):
print self.pool.map(printed,(1,2),(3,4))
if __name__ == '__main__':
aa = A()
aa.callme()
but it gives me following error
TypeError: printed() takes exactly 2 arguments (1 given)
I have tried solutions from other answers here but they are not working for me. How can i resolve it and what is the reason for this problem (I did not get the pickle POV)
回答1:
You should be giving args in array
from multiprocessing import Pool
import time
def printed(*args):
print 'here now '
return args[0][0]
class A(object):
def __init__(self):
self.pool = Pool(8)
def callme(self):
print self.pool.map(printed,[(1,2),(3,4)])
if __name__ == '__main__':
aa = A()
aa.callme()
来源：https://stackoverflow.com/questions/29427460/python-multiprocessing-pool-map-with-multiple-arguments