Python多重处理:读取大文件并更新导入的字典 [英] Python multiprocessing: Reading a large file and updating an imported dictionary
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问题描述
我需要使用 multiprocessing
Pool
和 Manager
来读取大文件并相应地更新导入的字典.这是我的代码:
I need to read a large file and update an imported dictionary accordingly, using multiprocessing
Pool
and Manager
. Here is my code:
from multiprocessing import Pool, Manager
manager = Manager()
d = manager.dict()
imported_dic = json.load(~/file.json) #loading a file containing a large dictionary
d.update(imported_dic)
def f(line):
data = line.split('\t')
uid = data[0]
tweet = data[2].decode('utf-8')
if #sth in tweet:
d[uid] += 1
p = Pool(4)
with open('~/test_1k.txt') as source_file:
p.map(f, source_file)
但是它不能正常工作.知道我在这里做错什么吗?
But it does not work properly. Any idea what am I doing wrong here?
推荐答案
尝试以下代码:
d = init_dictionary( ) # some your magic here
def f(line):
data = line.split('\t')
uid = data[0]
tweet = data[2].decode('utf-8')
if uid in d:
for n in d[uid].keys():
if n in tweet:
yield uid, n, 1
else:
yield uid, n, 0
p = Pool(4)
with open('~/test_1k.txt') as source_file:
for stat in p.map(f, source_file):
uid, n, r = stat
d[uid][n] += r
这是相同的解决方案,但没有共享字典.
It's same solution, but without shared dictionary.
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