old_contents: from st2reactor.sensor.base import PollingSensor
  
  from environ import get_environ
  
  
  class FibonacciSensor(PollingSensor):
  
      def __init__(self, sensor_service, config,
                   poll_interval=5):
          super(FibonacciSensor, self).__init__(
              sensor_service=sensor_service,
              config=config,
              poll_interval=poll_interval
          )
          self.a = None
          self.b = None
          self.count = None
          self.logger = None
  
      def setup(self):
          self.a = 0
          self.b = 1
          self.count = 2
          self.logger = self.sensor_service.get_logger(name=self.__class__.__name__)
  
      def poll(self):
          fib = self.a + self.b
          self.logger.debug('Count: %d, a: %d, b: %d', self.count, self.a, self.b)
  
          payload = {
              "count": self.count,
              "fibonacci": fib,
              "pythonpath": get_environ("PYTHONPATH")
          }
  
          self.sensor_service.dispatch(trigger="examples.fibonacci", payload=payload)
          self.a = self.b
          self.b = fib
          self.count = self.count + 1
  
      def cleanup(self):
          pass
  
      def add_trigger(self, trigger):
          # This method is called when trigger is created
          pass
  
      def update_trigger(self, trigger):
          # This method is called when trigger is updated
          pass
  
      def remove_trigger(self, trigger):
          # This method is called when trigger is deleted
          pass
  
new_contents: import os
  
  from st2reactor.sensor.base import PollingSensor
  
  
  class FibonacciSensor(PollingSensor):
  
      def __init__(self, sensor_service, config,
                   poll_interval=5):
          super(FibonacciSensor, self).__init__(
              sensor_service=sensor_service,
              config=config,
              poll_interval=poll_interval
          )
          self.a = None
          self.b = None
          self.count = None
          self.logger = None
  
      def setup(self):
          self.a = 0
          self.b = 1
          self.count = 2
          self.logger = self.sensor_service.get_logger(name=self.__class__.__name__)
  
      def poll(self):
          fib = self.a + self.b
          self.logger.debug('Count: %d, a: %d, b: %d', self.count, self.a, self.b)
  
          payload = {
              "count": self.count,
              "fibonacci": fib,
              "pythonpath": os.environ.get("PYTHONPATH", None)
          }
  
          self.sensor_service.dispatch(trigger="examples.fibonacci", payload=payload)
          self.a = self.b
          self.b = fib
          self.count = self.count + 1
  
      def cleanup(self):
          pass
  
      def add_trigger(self, trigger):
          # This method is called when trigger is created
          pass
  
      def update_trigger(self, trigger):
          # This method is called when trigger is updated
          pass
  
      def remove_trigger(self, trigger):
          # This method is called when trigger is deleted
          pass
  
subject: Fix fibonacci sensor so it works under Python 3.