This script helps you to calculate the total income from a Google merchants payment report CSV file.

extract_app_income_google_merchant.py

#!/usr/bin/env python

import csv
import sys
import os.path
from decimal import Decimal


def endswith_case_insensitive(a, b):
    a_lower = a.lower()
    b_lower = b.lower()
    return a_lower.endswith(b_lower)

print("This script helps you to calculate the total income from a Google merchants payment report CSV file.")

# use "earnings.csv" as default
filename = "earnings.csv"
filename_input = input("Filename of the CSV file (\"earnings.csv\"): ")

if filename_input:
    filename = filename_input

# add file extension if not exists
if not endswith_case_insensitive(filename, ".csv"):
    filename += ".csv"

# abort if file not exists
if not os.path.isfile(filename):
    print("The file \"" + filename + "\" doesn't exist.")
    sys.exit(2)


product_id = input("App package (optional): ")
sku_id = input("SKU ID (optional): ")

print("Reading file \"" + filename + "\"...")

with open(filename, encoding="utf8") as csv_file:
    reader = csv.DictReader(csv_file)
    i = 0
    currency = ""
    income_sum = Decimal(0)
    for row in reader:
        i += 1

        if not currency:
            currency = row["Merchant Currency"]
        elif currency != row["Merchant Currency"]:
            print("The file contains multiple merchant currencies and therefore can't be parsed.")
            sys.exit(3)

        if (not product_id or product_id == row["Product id"]) and (not sku_id or sku_id == row["Sku Id"]):
            income_sum += Decimal(row["Amount (Merchant Currency)"])

    print("Parsed " + str(i) + " elements.")
    if not currency:
        print("Income sum: " + str(income_sum) + " (no currency)")
    else:
        print("Sum: " + str(income_sum) + " " + str(currency))

Needs Python 3