# Manipulate the Data/portfolio.csv CSV file

# Compute the cost of all the stocks

import sys

import csv

def portfolio_cost(filename):

with open(filename, 'rt') as f:

rows = csv.reader(f)

headers = next(rows)

total_cost = 0

for lineno, stock in enumerate(rows, start=1):

try:

shares = int(stock[1])

share_cost = float(stock[2])

total_cost = total_cost + shares * share_cost

except ValueError:

print(

f"Warning: skipping invalid entry '{stock} on line {lineno}")

return total_cost

if len(sys.argv) == 2:

filename = sys.argv[1]

else:

filename = 'Data/portfolio.csv'

total_cost = portfolio_cost(filename)

print('Total cost', total_cost)