config_loader.py

import configparser
import sys

def load(config_file):
    """
    Source from my repo: https://github.com/jforjohn/procapi/blob/master/dbod/config.py
    Reads configuration file
    """
    requiredConfig = {
        'cn2': ['dataset',
                'output_dir'
                #'bins_no',
                #'beam_width',
                #'min_significance',
                #'negate',
                #'disjunctive',
                #'train_percentage'
        	   ],
    }
    try:
        # Load configuration from file
        config = configparser.ConfigParser()
        number_read_files = config.read(config_file)

        # check the config file exist and can be read
        if len(number_read_files) != 1:
            print("Configuration file '{0}' cannot be read or does not exist. Stopping.".format(args.config))
            sys.exit(1)

        # Force load of all required fields to avoid errors in runtime
        for section, options in requiredConfig.items():
            for option in options:
                try:
                    config.get(section, option)
                except configparser.NoSectionError:
                    print("Section '{0}' not present in config file. Stopping.".format(section))
                    sys.exit(2)
                except configparser.NoOptionError:
                    print("Option '{0}' not present in section {1} in config file. Stopping.".format(option, section))
                    sys.exit(2)
        return config

    except IOError as e:
        traceback.print_exc(file=sys.stdout)
        sys.exit(e.code)