setup.py that builds data files in correct location using stdeb , if installed in venv it puts it in sys.prefix + <path>

setup.py

# pylint: disable=c0111
from netshowlib import get_version
import os
import sys
try:
    from setuptools import setup, find_packages
except ImportError:
    import ez_setup
    ez_setup.use_setuptools()
    from setuptools import setup, find_packages

from distutils.command.install_data import install_data
import re


class PostInstall(install_data):
    def run(self):
        # Call parent
        install_data.run(self)
        # Execute commands
        print sys.__dict__
        print os.environ


def var_dir():
    _var_dir = '/var'
    # this first if ensure stdeb installs system file in the right place
    if not re.search('deb_dist', os.environ.get('PWD')):
        # these 2 checks are to see if build is happen on virtualenv or pyvenv
        if os.environ.get('VIRTUAL_ENV') or hasattr(sys, 'real_prefix'):
            _var_dir = os.path.join(sys.prefix, 'var')

    return os.path.join(_var_dir, 'lib', 'netshow', 'discovery')

setup(
    name='linux-netshow-lib',
    version=get_version(),
    url="http://github.com/CumulusNetworks/netshow-lib",
    description="Python Library to Abstract Linux Networking Data",
    author='Cumulus Networks',
    author_email='[email protected]',
    packages=find_packages(),
    zip_safe=False,
    license='GPLv2',
    #    namespace_packages=['netshowlib'],
    package_data={'data': ['*']},
    classifiers=[
        'Topic :: System :: Networking',
        'Intended Audience :: Developers',
        'Intended Audience :: System Administrators',
        'Operating System :: POSIX :: Linux'
    ],
    data_files=[(var_dir(), ['data/discovery/linux'])],
    cmdclass={'install_data': PostInstall}
)
(mypython2)