2015-06-25 54 views
1

我正在使用concurrent.futures多线程编写我正在编写的应用程序。Concurrent.futures - 返回导入模块未定义的错误

from netaddr import IPNetwork, IPAddress 

接下来,我需要一些输入文件,我通过他们的进入我的功能被多线程:

with open(options.filename) as f: 
    contents = f.readlines() 
    executor = concurrent.futures.ProcessPoolExecutor(threads) 
    futures = [executor.submit(ip_compare, ip, scope_list) for ip in contents] 

那我等得到

我从netaddr中输入ip地址启动应用程序结果完成并将它们追加到输出变量:

for future in concurrent.futures.as_completed(futures): 
    output.append(future.results() 

我遇到的问题是t帽子我不断收到来自未来EXCETION:

global name 'IPAddress' is not defined 

这里是ip_compare功能:

def ip_compare(ip_addr, scope_list): 
    ip_addr = ip_addr.rstrip() 
    if not is_ipv4(ip_addr): 
     try: 
      ip = socket.gethostbyname(ip_addr) 
     except: 
      return "error," + ip_addr + ",,," + str(sys.exc_info()[0]).replace(',',';') + "\r\n" 
    else: 
     ip = ip_addr 
    for scope in scope_list: 
     if IPAddress(ip) in IPNetwork(scope): 
      return "in," + ip_addr + "," + ip + "," + scope + ",\r\n" 
    return "out," + ip_addr + "," + ip + "," + ",,\r\n" 

任何想法,为什么期货不能识别加载模块?

当我的IDE停止脚本的执行,因为错误的,我可以清楚地看到,ip地址是在内存中定义:

IPAddress = {type} <class 'netaddr.ip.IPAddress'> 

回答

1

确定这样的问题是,我是从内主要进口netaddr中:

if __name__=="__main__": 
try: 
    from netaddr import IPNetwork, IPAddress 
except ImportError as error: 
    print "Please install netaddr.\r\npip install netaddr\r\n\r\nIf pip is not installed, install pip\r\nhttps://pip.pypa.io/en/latest/installing.html" 

我把它移到脚本的顶部,一切正常。我很好奇,为什么这个工作虽然,如果任何人都可以回答。

+0

Per [the docs](https://docs.python.org/3/library/concurrent.futures.html#processpoolexecutor),*“__main__'模块必须可由工作程序子进程导入,这意味着ProcessPoolExecutor在交互式解释器中不起作用。“*这意味着每个工作者子过程输入'__main__'模块。因此'if __name__ =='__main __''之外的全局变量被定义。 'if语句'中的那些不会被执行。 – unutbu