Config parser python2/3

In python 2/3 the modules has changes:

import os
try:
    # Python3
    import configparser as configparser
except ImportError:
    # Python2
    import ConfigParser as configparser

config = configparser.ConfigParser()
config.read(os.environ['MY_INI_FILE'])

    # Use get instead of [] accessor to keep compatibility with both py2/py3
config.get(section='my_section', option='my_var')
config.get(section='my_section', option='my_var1')
config.get(section='my_section', option='my_var2')