Exercise 2.4 - Solution
(d) Using the zip() function
# report.py
import csv
def read_portfolio(filename):
'''
Read a stock portfolio file into a list of dictionaries with keys
name, shares, and price.
'''
portfolio = []
f = open(filename)
f_csv = csv.reader(f)
headers = next(f_csv)
for row in f_csv:
record = dict(zip(headers, row))
stock = {
'name' : record['name'],
'shares' : int(record['shares']),
'price' : float(record['price'])
}
portfolio.append(stock)
f.close()
return portfolio
def read_prices(filename):
'''
Read a CSV file of price data into a dict mapping names to prices.
'''
prices = {}
f = open(filename)
f_csv = csv.reader(f)
for row in f_csv:
try:
prices[row[0]] = float(row[1])
except IndexError:
pass
f.close()
return prices
def make_report(portfolio, prices):
'''
Make a list of (name, shares, price, change) tuples given a portfolio list
and prices dictionary.
'''
rows = []
for stock in portfolio:
current_price = prices[stock['name']]
change = current_price - stock['price']
summary = (stock['name'], stock['shares'], current_price, change)
rows.append(summary)
return rows
# Read data files and create the report data
portfolio = read_portfolio('../../Data/portfoliodate.csv')
prices = read_prices('../../Data/prices.csv')
# Generate the report data
report = make_report(portfolio, prices)
# Output the report
headers = ('Name', 'Shares', 'Price', 'Change')
print ('%10s ' * len(headers)) % headers
print ('-' * 10 + ' ') * len(headers)
for row in report:
print '%10s %10d %10.2f %10.2f' % row
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