fair_bill.py -h
usage: fair_bill.py [-h] file_name

positional arguments: file_name

optional arguments: -h, --help show this help message and exit

examples: fair_bill.py app_log9.txt foo bar

ALICE99 4 240

CHARLIE 3 37

fair_bill.py app_log9.txt

ALICE99 4 240

CHARLIE 3 37

fair_bill.py usage: fair_bill.py [-h] file_name fair_bill.py: error: the following arguments are required: file_name