import csv

import sys

def portfolio_cost(filename):

"""Read csv file with stock portfolio and compute the total cost"""

total_cost = 0

with open(filename) as csvfile:

reader = csv.DictReader(csvfile)

for rowno, row in enumerate(reader):

try:

total_cost += int(row['shares']) * float(row['price'])

except ValueError as err:

print(f'Row {rowno}: Bad row: {row}'

f'\nThe line is not used in the computation of Total cost'

f'\nErrormessage: {err}')

return total_cost

if __name__ == '__main__':

if len(sys.argv) == 2:

filename = sys.argv[1]

else:

filename = 'Data/portfolio.csv'

print(filename)

cost = portfolio_cost(filename)

print(f'Total cost {cost:0.2f}')