sierra check-digit logic

sierra_check_digit.py

'''
Usage: $ python3 /path/to/sierra_check_digit.py 15990359
   or: $ python3 /path/to/sierra_check_digit.py 15990359 DEBUG
'''

import logging, sys

log = logging.getLogger(__name__)

def build_check_digit( raw_item_id ):
    """ Calculates sierra check-digit.
        Logic based on: <https://csdirect.iii.com/sierrahelp/Content/sril/sril_records_numbers.html> """
    data = str(raw_item_id).replace('-', '').replace(' ', '')  # Removes Hyphens and Spaces
    reversed_data = ''.join( reversed(data) )
    total = 0
    for counter,character in enumerate( reversed_data ):
        log.debug( f'character, `{character}`' )
        one_index = counter + 1
        log.debug( f'one_index, `{one_index}`' )
        multiplier = one_index + 1
        log.debug( f'multiplier, `{multiplier}`' )
        multiplied = int(character) * multiplier
        log.debug( f'multiplied, `{multiplied}`' )
        total += multiplied
        log.debug( f'total, `{total}`' )
    check_digit = (total % 11)
    if check_digit == 10:
        check_digit = 'x'
    log.debug( f'check_digit, `{check_digit}`' )
    return check_digit

def config_log( log_level ):
    level_dct = { 'DEBUG': logging.DEBUG, 'INFO': logging.INFO }
    logging.basicConfig(
        level=level_dct[log_level],
        format='[%(asctime)s] %(levelname)s [%(module)s-%(funcName)s()::%(lineno)d] %(message)s', datefmt='%d/%b/%Y %H:%M:%S' )


if __name__ == '__main__':
    raw_item_number = sys.argv[1]
    try:
        log_level = sys.argv[2]
    except:
        log_level = 'INFO'
    config_log( log_level )
    check_digit = build_check_digit( raw_item_number )
    print( f'check_digit, `{check_digit}`' )

## EOF