传递 kwargs 时的 Python 多处理问题

Question

我试图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(精简为仅包含线程代码):

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，我没有收到任何错误，但在 DB() 方面，我的代码看起来很简单，是这样的:

import MySQLdb

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

问题是 __init__ 函数中的打印命令不打印任何内容，我明白了:

  None {} 

Answer 1

您正在调用 DB，而不是将 DB 传递给 pool.apply_async。

删除():

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