title: Python: exception in Thread
body: <p>Im trying to execute a program in a python subprocess:</p>
  
  <pre><code>class MiThread(threading.Thread):  
        def __init__(self):  
            threading.Thread.__init__(self)   
  
        def run(self):
          try:
              from Queue import Queue, Empty
          except ImportError:
      #from queue import Queue, Empty  # python 3.x
              print "error"
          ON_POSIX = 'posix' in sys.builtin_module_names
  
          def enqueue_output(out, queue):
              for line in iter(out.readline, b''):
                  queue.put(line)
              out.close()
          p= Popen(["java -Xmx256m -jar bin/HelloWorld.jar"],cwd=r'/home/karen/sphinx4-1.0beta5-src/sphinx4-1.0beta5/',stdout=PIPE, shell=True, bufsize= 4024)
          q = Queue()
          t = Thread(target=enqueue_output, args=(p.stdout, q))
          print "estoy en el hilo"
          t.daemon = True # thread dies with the program
          t.start()
  
                  print l
  </code></pre>
  
  <p>But when i execute the thread it fails with the following error:</p>
  
  <pre><code>Exception in thread Thread-1:
  Traceback (most recent call last):
    File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
      self.run()
    File "/usr/lib/python2.7/site-packages/GNS3/Workspace.py", line 65, in run
      t = Thread(target=enqueue_output, args=(p.stdout, q))
  NameError: global name 'Thread' is not defined
  
  QObject::connect: Cannot queue arguments of type 'QTextCursor'
  (Make sure 'QTextCursor' is registered using qRegisterMetaType().)
  </code></pre>
  
  <p>i dont have any idea! What is happening?</p>