#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
File: run.py
Author: huxuan <i(at)huxuan.org>
Description: Run script for app.
"""
import os.path

if not os.path.isfile('config.py'):
    raise Exception('Please copy `config.sample.py` to `config.py` with proper'
                    'configuration to make it work.')

from app import app


def main():
    """ Main function for run script. """
    app.run()

if __name__ == '__main__':
    main()

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
File: run.py
Author: huxuan <i(at)huxuan.org>
Description: Run script for app.
"""
import os.path

if not os.path.isfile('config.py'):
    raise Exception('Please copy `config.sample.py` to `config.py` with proper'
                    ' configuration to make it work.')

from app import app


def main():
    """ Main function for run script. """
    app.run()

if __name__ == '__main__':
    main()

Add missing space for exception message.
Add missing space for exception message.
