传递kwargs时Python多处理问题

时间:2013-08-27 16:04:21

标签: python threadpool python-multithreading kwargs keyword-argument

我正在尝试在类中创建一个线程来启动另一个类构造函数,但似乎pool.apply_async没有像我期望的那样传递kwargs。这是我的代码(修剪为仅包含线程代码):

from MyDatabaseScript import DB

class Trinity:
      def __init__(self):

      #lets split a thread off and work on connecting to the mysql server
      pool = ThreadPool(processes=1) #establish the thread pool

      #I want to pass 'self' as an arg to DB because the Trinity instance has class variables that I want to use
      args, kwargs = (self,), {"host":"my.server.name", "user": "databaseuser", "passwd": "xxxxxxxxxxx", "db": "database name"} 

      async_result = pool.apply_async(DB(), args, kwargs) #create the thread pool call for the DB class with the kwargs

现在一切正常,我没有得到任何错误,但在DB()方面,我的代码看起来很简单,就是这样:

import MySQLdb

class DB:
      def __init__( self, tms=None, **kwargs ):
          print tms, kwargs

问题是__init__功能中的打印命令没有打印任何内容,我明白了:

  None {} 

1 个答案:

答案 0 :(得分:3)

您正在呼叫DB,而不是将DB传递给pool.apply_async

删除()

async_result = pool.apply_async(DB, args, kwargs)