old_contents: # Implements I/O over asynchronous sockets
  from time import time
  from sys import exc_info
  from asyncore import socket_map
  from asyncore import loop
  from pysnmp.carrier.base import AbstractTransportDispatcher
  from pysnmp.error import PySnmpError
  
  class AsynsockDispatcher(AbstractTransportDispatcher):
      def __init__(self):
          self.__sockMap = {} # use own map for MT safety
          self.timeout = 0.5
          AbstractTransportDispatcher.__init__(self)
  
      def getSocketMap(self): return self.__sockMap
      def setSocketMap(self, sockMap=socket_map): self.__sockMap = sockMap
      
      def registerTransport(self, tDomain, t):
          AbstractTransportDispatcher.registerTransport(self, tDomain, t)
          t.registerSocket(self.__sockMap)
  
      def unregisterTransport(self, tDomain):
          self.getTransport(tDomain).unregisterSocket(self.__sockMap)
          AbstractTransportDispatcher.unregisterTransport(self, tDomain)
  
      def transportsAreWorking(self):
          for transport in self.__sockMap.values():
              if transport.writable():
                  return 1
          return 0
      
      def runDispatcher(self, timeout=0.0):
          while self.jobsArePending() or self.transportsAreWorking():
              try:
                  loop(timeout and timeout or self.timeout,
                       use_poll=True, map=self.__sockMap, count=1)
              except:
                  raise PySnmpError('poll error: %s' % exc_info()[1])
              self.handleTimerTick(time())
  
new_contents: # Implements I/O over asynchronous sockets
  from time import time
  from sys import exc_info
  from asyncore import socket_map
  from asyncore import loop
  from pysnmp.carrier.base import AbstractTransportDispatcher
  from pysnmp.error import PySnmpError
  
  class AsynsockDispatcher(AbstractTransportDispatcher):
      def __init__(self):
          self.__sockMap = {} # use own map for MT safety
          self.timeout = 0.5
          AbstractTransportDispatcher.__init__(self)
  
      def getSocketMap(self): return self.__sockMap
      def setSocketMap(self, sockMap=socket_map): self.__sockMap = sockMap
      
      def registerTransport(self, tDomain, t):
          AbstractTransportDispatcher.registerTransport(self, tDomain, t)
          t.registerSocket(self.__sockMap)
  
      def unregisterTransport(self, tDomain):
          self.getTransport(tDomain).unregisterSocket(self.__sockMap)
          AbstractTransportDispatcher.unregisterTransport(self, tDomain)
  
      def transportsAreWorking(self):
          for transport in self.__sockMap.values():
              if transport.writable():
                  return 1
          return 0
      
      def runDispatcher(self, timeout=0.0):
          while self.jobsArePending() or self.transportsAreWorking():
              try:
                  loop(timeout and timeout or self.timeout,
                       use_poll=True, map=self.__sockMap, count=1)
              except KeyboardInterrupt:
                  raise
              except:
                  raise PySnmpError('poll error: %s' % exc_info()[1])
              self.handleTimerTick(time())
  
subject: raise KeyboardInterrupt for backward compatibility