old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import time
  import rospy
  import math
  from raspimouse_ros.msg import LightSensorValues
  from sensor_msgs.msg import LaserScan
  
  
  def range_to_led(range_value):
      try:
          distance = int(range_value[0]*1000) # distance[mm]
          if distance < 4:
              distance = 8 - distance
  
          led_value = int( 761000 / math.pow(distance,1.66) )
  
          if led_value > 4000:
              led_value = 4000
          if led_value < 15:
              led_value = 15
      except:
          led_value = 15 
      # rospy.loginfo(led_value)
      return led_value
      # return distance
  
  def write_to_file(data):
      try:
          with open("/dev/rtlightsensor0", "w") as f:
              print >> f, "%d %d %d %d" % tuple(data)
      except:
          rospy.logerr("failed to open rtlightsensor0")
  
  def sensor1_callback(data):
      hoge[0] = range_to_led(data.ranges)
      # write_to_file(hoge)
  
  def sensor2_callback(data):
      hoge[1] = range_to_led(data.ranges)
      # write_to_file(hoge)
  
  def sensor3_callback(data):
      hoge[2] = range_to_led(data.ranges)
      # write_to_file(hoge)
  
  def sensor4_callback(data):
      hoge[3] = range_to_led(data.ranges)
      write_to_file(hoge)
  
  def listener():
      rospy.Subscriber("/raspimouse_on_gazebo/rf_scan", LaserScan, sensor1_callback)
      rospy.Subscriber("/raspimouse_on_gazebo/rs_scan", LaserScan, sensor2_callback)
      rospy.Subscriber("/raspimouse_on_gazebo/ls_scan", LaserScan, sensor3_callback)
      rospy.Subscriber("/raspimouse_on_gazebo/lf_scan", LaserScan, sensor4_callback)
  
  if __name__ == "__main__":
      hoge = [15, 15, 15, 15]
      rospy.init_node("sensor_data_converter", anonymous=True)
      listener()
      rospy.spin()
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import time
  import rospy
  import math
  from raspimouse_ros.msg import LightSensorValues
  from sensor_msgs.msg import LaserScan
  
  
  def range_to_led(range_value):
      try:
          distance = int(range_value[0]*1000) # distance[mm]
          if distance < 4:
              distance = 8 - distance
  
          led_value = int( 761000 / math.pow(distance,1.66) )
  
          if led_value > 4000:
              led_value = 4000
          if led_value < 15:
              led_value = 15
      except:
          led_value = 15 
      # rospy.loginfo(led_value)
      return led_value
      # return distance
  
  def write_to_file(data):
      try:
          with open("/dev/rtlightsensor0", "w") as f:
              print >> f, "%d %d %d %d" % tuple(data)
      except:
          rospy.logerr("failed to open rtlightsensor0")
  
  def sensor1_callback(data):
      led_val[0] = range_to_led(data.ranges)
      # write_to_file(led_val)
  
  def sensor2_callback(data):
      led_val[1] = range_to_led(data.ranges)
      # write_to_file(led_val)
  
  def sensor3_callback(data):
      led_val[2] = range_to_led(data.ranges)
      # write_to_file(led_val)
  
  def sensor4_callback(data):
      led_val[3] = range_to_led(data.ranges)
      write_to_file(led_val)
  
  def listener():
      rospy.Subscriber("/raspimouse_on_gazebo/rf_scan", LaserScan, sensor1_callback)
      rospy.Subscriber("/raspimouse_on_gazebo/rs_scan", LaserScan, sensor2_callback)
      rospy.Subscriber("/raspimouse_on_gazebo/ls_scan", LaserScan, sensor3_callback)
      rospy.Subscriber("/raspimouse_on_gazebo/lf_scan", LaserScan, sensor4_callback)
  
  if __name__ == "__main__":
      led_val = [15, 15, 15, 15]
      rospy.init_node("sensor_data_converter", anonymous=True)
      listener()
      rospy.spin()
  
subject: Fix variable name