用Python实现树形算法的并行计算

import multiprocessing

def calculate(node):
    if node.is_leaf:
        return node.value
    pool = multiprocessing.Pool(processes=4)
    result = []
    for child in node.children:
        result.append(pool.apply_async(calculate, args=(child,)))
    pool.close()
    pool.join()
    total = node.value
    for r in result:
        total += r.get()
    return total

class Node:
    def __init__(self, value, is_leaf=False):
        self.value = value
        self.is_leaf = is_leaf
        self.children = []

    def add_child(self, child):
        self.children.append(child)

# 构建测试用的树形结构
root = Node(1)
node2 = Node(2)
node3 = Node(3)
node4 = Node(4)
node5 = Node(5, is_leaf=True)
node6 = Node(6, is_leaf=True)
node7 = Node(7, is_leaf=True)
node8 = Node(8, is_leaf=True)

root.add_child(node2)
root.add_child(node3)
node2.add_child(node4)
node2.add_child(node5)
node3.add_child(node6)
node3.add_child(node7)
node3.add_child(node8)

result = calculate(root)
print(result)