Implement p0 tutorial.

p0_tutorial/buyLotsOfFruit.py

@@ -32,12 +32,15 @@ def buyLotsOfFruit(orderList):
 
     Returns cost of order
     """
-    totalCost = 0.0
-    "*** YOUR CODE HERE ***"
-    return totalCost
-
+    try:
+        return sum([fruitPrices[fruit] * quantity
+                    for fruit, quantity in orderList])
+    except KeyError:
+        print("Unexpected fruit!")
+        return None
+        
 # Main Method
 if __name__ == '__main__':
     "This code runs when you invoke the script from the command line"
     orderList = [ ('apples', 2.0), ('pears', 3.0), ('limes', 4.0) ]
-    print 'Cost of', orderList, 'is', buyLotsOfFruit(orderList)
+    print('Cost of', orderList, 'is', buyLotsOfFruit(orderList))