PEP8 compliant stub for building Python CLI tools

cli_stub.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vim: ft=python ts=4 sw=4 expandtab

"""A stub for command line applications in Python."""

__version__ = "0.0.0"

import argparse
import os
import sys


class CLI:
    """Class that implements the application logic for the command line
    application."""
    def __init__(self, args):
        self.verbose = args.verbose
        self.files = args.file

    def main(self):
        """Where the application logic runs."""
        result = os.EX_OK
        for in_file in self.files:
            for line in in_file:
                print(line.strip())

        return result


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument(
            '-v', '--verbose',
            help="be more verbose",
            action='store_true')
    parser.add_argument(
            '-V', '--version',
            help="display version information and exit",
            action='store_true')
    parser.add_argument(
            'file',
            help="read from this file. defaults to STDIN",
            type=argparse.FileType('r'),
            nargs='*',
            default=[sys.stdin, ])
    arguments = parser.parse_args()

    exit_code = os.EX_SOFTWARE
    if arguments.version:
        print("{program} {version}".format(
            program=os.path.basename(__file__),
            version=__version__))
    else:
        try:
            cli = CLI(arguments)
            exit_code = cli.main()
        except KeyboardInterrupt:
            exit_code = os.EX_OK
        except IOError as ioe:
            if ioe.errno == 32:  # Broken pipe
                exit_code = os.EX_OK
            else:
                raise
    sys.exit(exit_code)