On Tuesday, 6 August 2013 18:12:26 UTC+1, Luca Cerone wrote: > Hi guys, > > I would like to apply the Pool.map method to a member of a class. > > > > Here is a small example that shows what I would like to do: > > > > from multiprocessing import Pool > > > > class A(object): > > def __init__(self,x): > > self.value = x > > def fun(self,x): > > return self.value**x > > > > > > l = range(10) > > > > p = Pool(4) > > > > op = p.map(A.fun,l) > > > > #using this with the normal map doesn't cause any problem > > > > This fails because it says that the methods can't be pickled. > > (I assume it has something to do with the note in the documentation: > "functionality within this package requires that the __main__ module be > importable by the children.", which is obscure to me). > > > > I would like to understand two things: why my code fails and when I can > expect it to fail? what is a possible workaround? > > > > Thanks a lot in advance to everybody for the help! > > > > Cheers, > > Luca
On Tuesday, 6 August 2013 18:12:26 UTC+1, Luca Cerone wrote: > Hi guys, > > I would like to apply the Pool.map method to a member of a class. > > > > Here is a small example that shows what I would like to do: > > > > from multiprocessing import Pool > > > > class A(object): > > def __init__(self,x): > > self.value = x > > def fun(self,x): > > return self.value**x > > > > > > l = range(10) > > > > p = Pool(4) > > > > op = p.map(A.fun,l) > > > > #using this with the normal map doesn't cause any problem > > > > This fails because it says that the methods can't be pickled. > > (I assume it has something to do with the note in the documentation: > "functionality within this package requires that the __main__ module be > importable by the children.", which is obscure to me). > > > > I would like to understand two things: why my code fails and when I can > expect it to fail? what is a possible workaround? > > > > Thanks a lot in advance to everybody for the help! > > > > Cheers, > > Luca -- http://mail.python.org/mailman/listinfo/python-list
