Added solution code

Solutions/6_12/report.py

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+# report.py
+
+import fileparse
+from stock import Stock
+import tableformat
+from portfolio import Portfolio
+
+def read_portfolio(filename):
+    '''
+    Read a stock portfolio file into a list of dictionaries with keys
+    name, shares, and price.
+    '''
+    with open(filename) as lines:
+        portdicts = fileparse.parse_csv(lines, 
+                                        select=['name','shares','price'], 
+                                        types=[str,int,float])
+
+    portfolio = [ Stock(d['name'], d['shares'], d['price']) for d in portdicts ]
+    return Portfolio(portfolio)
+
+def read_prices(filename):
+    '''
+    Read a CSV file of price data into a dict mapping names to prices.
+    '''
+    with open(filename) as lines:
+        return dict(fileparse.parse_csv(lines, types=[str,float], has_headers=False))
+
+def make_report_data(portfolio, prices):
+    '''
+    Make a list of (name, shares, price, change) tuples given a portfolio list
+    and prices dictionary.
+    '''
+    rows = []
+    for s in portfolio:
+        current_price = prices[s.name]
+        change = current_price - s.price
+        summary = (s.name, s.shares, current_price, change)
+        rows.append(summary)
+    return rows
+
+def print_report(reportdata, formatter):
+    '''
+    Print a nicely formated table from a list of (name, shares, price, change) tuples.
+    '''
+    formatter.headings(['Name','Shares','Price','Change'])
+    for name, shares, price, change in reportdata:
+        rowdata = [ name, str(shares), f'{price:0.2f}', f'{change:0.2f}' ]
+        formatter.row(rowdata)
+
+def portfolio_report(portfoliofile, pricefile, fmt='txt'):
+    '''
+    Make a stock report given portfolio and price data files.
+    '''
+    # Read data files 
+    portfolio = read_portfolio(portfoliofile)
+    prices = read_prices(pricefile)
+
+    # Create the report data
+    report = make_report_data(portfolio, prices)
+
+    # Print it out
+    formatter = tableformat.create_formatter(fmt)
+    print_report(report, formatter)
+
+def main(args):
+    if len(args) != 4:
+        raise SystemExit('Usage: %s portfile pricefile format' % args[0])
+    portfolio_report(args[1], args[2], args[3])
+
+if __name__ == '__main__':
+    import sys
+    main(sys.argv)