相关疑难解决方法(0)

我试图重写一些csv读取代码,以便能够在Python 3.2.2中的多个核心上运行它.我尝试使用Pool多处理的对象,我从工作示例改编(并且已经为我的项目的另一部分工作).我遇到了一条错误消息,我发现很难解密和排除故障.

错误:

Traceback (most recent call last):
  File "parser5_nodots_parallel.py", line 256, in <module>
    MG,ppl = csv2graph(r)
  File "parser5_nodots_parallel.py", line 245, in csv2graph
    node_chunks)
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/multiprocessing/pool.py", line 552, in get
    raise self._value
AttributeError: __exit__

相关代码:

import csv
import time
import datetime
import re
from operator import itemgetter
from multiprocessing import Pool
import itertools

def chunks(l,n):
    """Divide a list of nodes `l` in `n` chunks"""
    l_c = iter(l)
    while …