new_contents: #!/usr/bin/env python
  
  ###############################################################################
  # Copyright 2018 The Apollo Authors. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  ###############################################################################
  """
  This program can extract raw gpsbin from rosbag directory into /tmp/gpsimu.bin.
  
  dump_gpsbin.py rosbag_input_directory
  
  """
  
  import argparse
  import glob
  import os
  import shutil
  
  import rosbag
  import std_msgs
  from std_msgs.msg import String
  
  g_args = None
  
  
  def dump_bag(in_dir):
      """out_bag = in_bag"""
      global g_args
      bag_files = glob.glob(in_dir + "/*.bag")
      f = file("/tmp/gpsimu.bin", 'w')
      for bag_file in sorted(bag_files):
          print "Processing ", bag_file, " ..."
          bag = rosbag.Bag(bag_file, 'r')
          for topic, msg, t in bag.read_messages():
              if topic == "/apollo/sensor/gnss/raw_data":
                  f.write(str(msg))
      f.close()
  
  
  if __name__ == "__main__":
      parser = argparse.ArgumentParser(
          description=
          "A tool to dump gpsimu raw data ")
      parser.add_argument(
          "in_dir", action="store", type=str, help="the input ros bag directory")
  
      g_args = parser.parse_args()
  
      dump_bag(g_args.in_dir)
      print "/tmp/gpsimu.bin is generated"
  
subject: add a tool to dump raw gps data.