...
from setuptools import setup

config = ConfigParser.ConfigParser()
rc = os.path.join(os.path.expanduser('~'), '.pypirc')
config.read(rc)
dependency_links = [
    'https://{}:{}@<private_url>'.format(
        config.get('dc', 'username'), config.get('dc', 'password'))]

setup(
    dependency_links=dependency_links,
    ...)