code: def build_parser():
      "Build an argparse argument parser to parse the command line."
  
      parser = argparse.ArgumentParser(
          description=,
          epilog="""Please file bugs on github at:
          https://github.com/coursera/courseraoauth2client/issues. If you
          would like to contribute to this tool's development, check us out at:
          https://github.com/coursera/courseraoauth2client""")
      parser.add_argument('-c', '--config', help='the configuration file to use')
      utils.add_logging_parser(parser)
  
      # We support multiple subcommands. These subcommands have their own
      # subparsers. Each subcommand should set a default value for the 'func'
      # option. We then call the parsed 'func' function, and execution carries on
      # from there.
      subparsers = parser.add_subparsers()
  
      commands.config.parser(subparsers)
      commands.version.parser(subparsers)
  
      return parser
docs: Build an argparse argument parser to parse the command line.