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Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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![Define a function called get_total_cost(items_dict, items_list) which takes two parameters as input. The first parameter is a dictionary where the keys represent the name of an item for sale, and the values represent
the cost of that item. The second parameter is a list containing the names of items to be purchased. The function should calculate the total cost associated with all of the items to be purchased.
For example, if the dictionary of item names and costs is:
items = {'apple': 12, "banana': 7, 'cherry': 10, 'dragonfruit': 35}
and the list of items to be purchased is:
selected= ['apple', 'apple', 'cherry', 'dragonfruit', 'cherry']
Then the total cost should be 79.
However, you must guard against two types of exceptions that could occur when calculating the total cost:
• KeyError: this could occur if an item on the list is not a valid key in the dictionary
• TypeError: this could occur if the cost of an item in the dictionary is not a number (in which case, the addition will fail)
You should handle any exceptions by simply ignoring any invalid values. You should calculate the result for all valid values.
Your function should return a tuple consisting of:
• The total cost
• The number of KeyErrors that were handled
• The number of TypeErrors that were handled
For example:
Test
Result
(79, 0, 0)
items = {'apple': 12, "banana': 7, "cherry': 10, 'dragonfruit': 35}
selected= ['apple', 'apple', 'cherry', 'dragonfruit', 'cherry']
cost = get_total_cost(items, selected)
print(cost)
(44, 1, 0)
items = {'apple': 12, "banana': 7, "cherry': 10, 'dragonfruit': 35}
selected = ['apple', 'apple', 'cherry', 'eggplant', 'cherry']
cost = get_total_cost(items, selected)
print(cost)
items = {'apple': 'XXXXX', 'banana': 7, "cherry': 10, 'dragonfruit': 35) (55, 0, 2)
selected= ['apple', 'apple', 'cherry', 'dragonfruit', 'cherry']
cost = get_total_cost(items, selected)
print(cost)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5faf0e02-1bc8-4d77-b991-33354dc1fdb4%2Fa7f96171-d456-4448-8df7-6a0774c91a9b%2Fl2xalsq_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Define a function called get_total_cost(items_dict, items_list) which takes two parameters as input. The first parameter is a dictionary where the keys represent the name of an item for sale, and the values represent
the cost of that item. The second parameter is a list containing the names of items to be purchased. The function should calculate the total cost associated with all of the items to be purchased.
For example, if the dictionary of item names and costs is:
items = {'apple': 12, "banana': 7, 'cherry': 10, 'dragonfruit': 35}
and the list of items to be purchased is:
selected= ['apple', 'apple', 'cherry', 'dragonfruit', 'cherry']
Then the total cost should be 79.
However, you must guard against two types of exceptions that could occur when calculating the total cost:
• KeyError: this could occur if an item on the list is not a valid key in the dictionary
• TypeError: this could occur if the cost of an item in the dictionary is not a number (in which case, the addition will fail)
You should handle any exceptions by simply ignoring any invalid values. You should calculate the result for all valid values.
Your function should return a tuple consisting of:
• The total cost
• The number of KeyErrors that were handled
• The number of TypeErrors that were handled
For example:
Test
Result
(79, 0, 0)
items = {'apple': 12, "banana': 7, "cherry': 10, 'dragonfruit': 35}
selected= ['apple', 'apple', 'cherry', 'dragonfruit', 'cherry']
cost = get_total_cost(items, selected)
print(cost)
(44, 1, 0)
items = {'apple': 12, "banana': 7, "cherry': 10, 'dragonfruit': 35}
selected = ['apple', 'apple', 'cherry', 'eggplant', 'cherry']
cost = get_total_cost(items, selected)
print(cost)
items = {'apple': 'XXXXX', 'banana': 7, "cherry': 10, 'dragonfruit': 35) (55, 0, 2)
selected= ['apple', 'apple', 'cherry', 'dragonfruit', 'cherry']
cost = get_total_cost(items, selected)
print(cost)
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