old_contents: #!/usr/bin/env python
  
  """Standalone script to check FAUCET configuration, return 0 if provided config OK."""
  
  # Copyright (C) 2015 Brad Cowie, Christopher Lorier and Joe Stringer.
  # Copyright (C) 2015 Research and Education Advanced Network New Zealand Ltd.
  # Copyright (C) 2015--2017 The Contributors
  #
  # 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.
  
  import logging
  import sys
  
  from faucet import valve
  from faucet.config_parser import dp_parser
  from faucet.conf import InvalidConfigError
  
  
  def check_config(conf_files, debug_level):
      """Return True and successful config dict, if all config can be parsed."""
      logname = '/dev/null'
      logger = logging.getLogger('%s.config' % logname)
      logger_handler = logging.StreamHandler(stream=sys.stderr)
      logger.addHandler(logger_handler)
      logger.propagate = 0
      logger.setLevel(debug_level)
      check_output = ''
      check_result = False
  
      for conf_file in conf_files:
          try:
              _, dps = dp_parser(conf_file, logname)
              for dp in dps:
                  valve_dp = valve.valve_factory(dp)
                  if valve_dp is None:
                      check_result = False
                      break
                  check_output = dp.to_conf()
                  check_result = True
          except InvalidConfigError as config_err:
              check_output = config_err
      return (check_result, check_output)
  
  
  def main():
      check_result, check_output = check_config(sys.argv[1:], logging.DEBUG)
      print(check_output)
      sys.exit(check_result)
  
  
  if __name__ == '__main__':
      main()
  
new_contents: #!/usr/bin/env python
  
  """Standalone script to check FAUCET configuration, return 0 if provided config OK."""
  
  # Copyright (C) 2015 Brad Cowie, Christopher Lorier and Joe Stringer.
  # Copyright (C) 2015 Research and Education Advanced Network New Zealand Ltd.
  # Copyright (C) 2015--2017 The Contributors
  #
  # 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.
  
  import logging
  import sys
  
  from faucet import valve
  from faucet.config_parser import dp_parser
  from faucet.conf import InvalidConfigError
  
  
  def check_config(conf_files, debug_level):
      """Return True and successful config dict, if all config can be parsed."""
      logname = '/dev/null'
      logger = logging.getLogger('%s.config' % logname)
      logger_handler = logging.StreamHandler(stream=sys.stderr)
      logger.addHandler(logger_handler)
      logger.propagate = 0
      logger.setLevel(debug_level)
      check_output = ''
      check_result = False
  
      for conf_file in conf_files:
          try:
              _, dps = dp_parser(conf_file, logname)
              for dp in dps:
                  valve_dp = valve.valve_factory(dp)
                  if valve_dp is None:
                      check_result = False
                      break
                  check_output = dp.to_conf()
                  check_result = True
          except InvalidConfigError as config_err:
              check_output = config_err
      return (check_result, check_output)
  
  
  def main():
      check_result, check_output = check_config(sys.argv[1:], logging.DEBUG)
      print(check_output)
      sys.exit(not check_result)
  
  
  if __name__ == '__main__':
      main()
  
subject: return value not correct.