Calculate total Amazon spending from Order Report

amazon_total.py

#!/usr/bin/env python
# vim: set ts=4 sw=4 expandtab:
"""

amazon_total.py
Calculate total cost of Amazon orders

Usage:
    - Login to your Amazon account, then click on 'Download order reports'
      Choose the time period, and Amazon will generate a CSV file for you.
      Make sure to choose the 'Orders and Shipments' report
    - Run this script against the CSV file you just saved:
      ./amazon_total.py my_2017_amazon_report.csv

@author J. Hipps <jacob@ycnrg.org>

"""

import sys
import csv

def get_total_from_csv(csvpath):
    try:
        with open(csvpath, 'r') as f:
            odata = [x for x in csv.DictReader(f)]
    except Exception as e:
        print("ERROR: Failed to parse CSV file: %s" % (str(e)))
        sys.exit(100)

    gtot = sum([float(x['Total Charged'][1:]) for x in odata])
    stot = sum([float(x['Subtotal'][1:]) for x in odata])
    ttot = sum([float(x['Tax Charged'][1:]) for x in odata])
    shtot = sum([float(x['Shipping Charge'][1:]) for x in odata])

    print("Orders   : {}".format(len(odata)))
    print("-----------------------------------------------")
    print("Subtotal : ${:>10.2f}".format(stot))
    print("Tax      : ${:>10.2f}".format(ttot))
    print("Shipping : ${:>10.2f}".format(shtot))
    print("-----------------------------------------------")
    print("TOTAL    : ${:>10.2f}\n".format(gtot))

def _main():
    if len(sys.argv) < 2:
        print("Usage: amazon_total.py REPORT.csv")
        sys.exit(1)

    get_total_from_csv(sys.argv[1])

if __name__ == '__main__':
    _main()