importing a config file prefixed with a dot

[Skaperen]

not withstanding this error in python3 , i made this module:

!/usr/bin/env python3
# -*- coding: utf-8 -*-
from __future__ import division, print_function, unicode_literals
"""Process a config file in Python format

file          pyconf.py
purpose       process a config file in python format
email         10054452614123394844460370234029112340408691

The intent is that this command works correctly under both Python 2 and
Python 3.  Please report failures or code improvement to the author.
"""

__license__ = """
Copyright (C) 2017, by Phil D. Howard - all other rights reserved

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA, OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

The author may be contacted by decoding the number
10054452614123394844460370234029112340408691
(provu igi la numeron al duuma)
"""

import os, pwd
from sys import argv, stderr, stdout, version_info

if version_info.major<3:
    ints=(int,long)
    strs=(str,unicode,)
else:
    ints=(int,)
    strs=(str,bytes,bytearray,)

def pyconf(*args,**opts):
    if len(args)>0:
        m='positional arguments are not used: '
        m+=', '.join([repr(a) for a in args])
        raise Exception(m)
    uid=opts.pop('uid',os.getuid())
    home=opts.pop('home',pwd.getpwuid(uid).pw_dir)
    maxsize=opts.pop('maxsize',1048576)
    if 'path' in opts:
        p=opts['path']
    else:
        p=home
        if 'dotdir' in opts:
            p += '/.' + opts.pop('dotdir')
        if 'subdir' in opts:
            p += '/' + opts.pop('subdir')
        p += '/' + opts.pop('name')
        if len(opts)>0:
            m='unknown option'
            if len(opts)>1:
                m+='s'
            m+=': '+', '.join([str(n)+'='+repr(v) for n,v in opts.items()])
            raise Exception(m)
    with open(p) as f:
        s=f.read(maxsize+1)
    if len(s)>maxsize:
        m='config file {} size is larger than {}'
        raise Exception(m.format(repr(p),repr(maxsize)))
    c={}
    print(s)
    exec(s,{},c)
    return c

def main(args):
    """main"""
    # config file is ~/.config/foo/bar.conf
    config = pyconf(dotdir='config',subdir='foo',name='bar.conf')
    for n,v in sorted(config.items()):
        print(repr(n),'=',repr(v))
    return config.pop('status',3)

if __name__ == '__main__':
    try:
        result=main(argv)
        stdout.flush()
    except KeyboardInterrupt:
        print('')
        result=99
    except IOError:
        result=98
    if result is 0 or result is None or result is True:
        exit(0)
    if result is 1 or result is False:
        exit(1)
    if isinstance(result,strs):
        print(result,file=stderr)
        exit(1)
    try:
        exit(int(result))
    except ValueError:
        print(str(result),file=stderr)
    except TypeError:
        exit(127)
# EOF

and made this silly config file at "~/.config/foo/bar.conf" ... that fails in python3 ... and works in python2

foo = 1
for n in range(10):
    locals()['foo'+str(n)+'bar'] = [n**m for m in range(9)]
bar = 0

i have not studied exceptions enough, yet, to know the best to use for exceptions i have the pyconf() function raise.  feedback about that is sought.