@@ -5,7 +5,7 @@
 def portfolio_cost(filename: str) -> float:
     """Returns the total cost of the portfolio"""
 
-    with open('Data/portfolio.csv', 'rt') as f:
+    with open(filename, 'rt') as f:
         total_cost = 0
         rows = csv.reader(f)
         next(rows)
 
@@ -1,3 +1,60 @@
-# report.py
-#
-# Exercise 2.4
+import csv
+import sys
+from pprint import pprint
+
+
+def read_portfolio(filename: str) -> list:
+    """Reads the portfolio files"""
+    
+    portfolio = []
+    with open(filename, 'rt') as f:
+        rows = csv.reader(f)
+        next(rows)  # skip the header
+        for row in rows:
+            try:
+                portfolio.append({'name': row[0], 'shares': int(row[1]), 'price': float(row[2])})
+            except ValueError:
+                print('broken line', row)
+
+    return portfolio
+
+
+def read_prices(filename: str) -> dict:
+    """Reads the file with assets prices"""
+
+    prices = {}
+    with open(filename, 'rt') as f:
+        rows = csv.reader(f)
+        for row in rows:
+            try:
+                prices[str(row[0])] = float(row[1])
+            except (ValueError, IndexError):
+                print('broken line', row)
+    
+    return prices
+
+
+def compute_investment_results(portfolio: dict, prices: dict) -> str:
+    """Computes wheather portfolio makes money or losses"""
+
+    result = 0.0
+    for asset in portfolio:
+        try:
+            result += asset['shares'] * (prices[asset['name']]  - asset['price'])
+        except KeyError:
+            print('no asset', asset['name'])
+
+    if result > 0:
+        return f'Investments are success! Total profit = {result}'
+    return f'Investments are failure! Total profit = {result}'
+
+
+if len(sys.argv) == 2:
+    filename = sys.argv[1]
+else:
+    filename = 'Data/portfolio.csv'
+
+prices = read_prices('Data/prices.csv')
+portfolio = read_portfolio('Data/portfolio.csv')
+result = compute_investment_results(portfolio, prices)
+print(result)