在python中並行化for循環

Question

有沒有可能在python中並行化下面的代碼？我想知道如何將這個代碼轉換地圖和lambda功能..

values = (1,2,3,4,5) 

def op(x,y): 
    return x+y 

[(i, j, op(i, j)) 
     for i in values 
     for j in values 
     if i is not j] 

Answer 1

可以並行化功能，運算與多與地圖：

from multiprocessing.dummy import Pool as ThreadPool 
from itertools import permutations 

pool = ThreadPool(4) # Number of threads 

values = (1,2,3,4,5) 
aux_val = [(i, j) for i,j in permutations(values,2)] 

def op(tupx): 
    result = (tupx[0], tupx[1], tupx[0] + tupx[1]) 
    return result 

results = pool.map(op, aux_val) 

Answer 2

檢查了這一點：

from itertools import permutations 

values = (1,2,3,4,5) 
[(i, j, i+j) for i, j in permutations(values, 2)] 

它在Python的STDLIB。

如果你想在並行運行，看看這個使用python3：

import multiprocessing 
from itertools import permutations 

values = [1, 2, 3, 4, 5] 
l = permutations(values, 2) 


def f(x): 
    return x[0], x[1], x[0] + x[1] 

with multiprocessing.Pool(5) as p: 
    data = p.map(f, l)