old_contents: """Command entry point."""
  #  Copyright 2015 Masayuki Yamamoto
  #
  #  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.
  
new_contents: """Command entry point."""
  #  Copyright 2015 Masayuki Yamamoto
  #
  #  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 argparse
  
  import yanico
  
  
  def create_main_parser():
      """Return command argument parser."""
      parser = argparse.ArgumentParser()
      parser.add_argument('--version', action='version',
                          version='yanico version '+yanico.__version__)
      parser.set_defaults(run=lambda _: parser.print_help())
      return parser
  
subject: Add create_main_parser function