>>> repr(Version(major=3, minor=2, micro=1, releaselevel='final', serial=4))
# Copyright © 2010-2012 Piotr Ożarowski <piotr@debian.org>
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
from os.path import exists
from configparser import ConfigParser
from types import GeneratorType
RANGE_PATTERN = r'(-)?(\d\.\d+)(?:(-)(\d\.\d+)?)?'
RANGE_RE = re.compile(RANGE_PATTERN)
VERSION_RE = re.compile(r'''
(?P<releaselevel>alpha|beta|candidate|final)?[.\s]?
(?P<serial>\d+)?''', re.VERBOSE)
log = logging.getLogger(__name__)
# try to read debian_defaults and get a list of supported Python versions and
# the default one from there
_supported = environ.get('DEBPYTHON3_SUPPORTED')
_default = environ.get('DEBPYTHON3_DEFAULT')