# pcost.py

import sys

def portfolio_cost(path):

stockdicts = []

with open(path) as f:

for row in f:

name, shares, price = row.split()

try:

shares = int(shares)

price = float(price)

d = dict(zip(['name', 'shares', 'price'], (name, shares, price)))

print(d)

stockdicts.append(d)

except ValueError as e:

print('Could not parse: ', row, end='')

print('Reason: ', e)

return sum(s['shares'] * s['price'] for s in stockdicts)

if __name__ == "__main__":

if len(sys.argv) != 2:

raise SystemExit('Usage: pcost portfile')

print('Total cost:', portfolio_cost(sys.argv[1]))