Assignment 1 Python Refresher

Introduction to Artificial Intelligence

Assignment 1

Python Refresher
The purpose of this assignment is to re-familiarize your self with Python. If you are
new to Python, before starting this assignment, you may want to also walk through
the Python tutorial found here:
http://inst.cs.berkeley.edu/~cs188/fa11/projects/tutorial/tutorial.html
All files needed for this assignment are included in the tutorial.zip file on
Moodle.
This assignment is reproduced from the Python Refresher assignment in the CS188x
Berkeley edX Artificial Intelligence course.
The tutorial.zip file should contain the following files:
• addition.py: source file for question 1
• buyLotsOfFruit.py: source file for question 2
• shop.py: source file for question 3
• shopSmart.py: source file for question 3
• autograder.py: autograding script
Other files, which you can ignore:
• test_cases: directory contains the test cases for each question
• grading.py: autograder code
• testClasses.py: autograder code
• tutorialTestClasses.py: test classes for this particular project
• projectParams.py: project parameters
The command:
python autograder.py
grades your solution to all three problems in this assignment. If you run it before editing
any files, you should get a page or two of output:
Question q1
===========
*** FAIL: test_cases/q1/addition1.test
*** add(a,b) must return the sum of a and b
*** student result: "0"
*** correct result: "2"
*** FAIL: test_cases/q1/addition2.test
*** add(a,b) must return the sum of a and b
*** student result: "0"
*** correct result: "5"
*** FAIL: test_cases/q1/addition3.test
*** add(a,b) must return the sum of a and b
*** student result: "0"
*** correct result: "7.9"
*** Tests failed.
### Question q1: 0/1 ###
Question q2
===========
*** FAIL: test_cases/q2/food_price1.test
*** buyLotsOfFruit must compute the correct cost of the order
*** student result: "0.0"
*** correct result: "12.25"
*** FAIL: test_cases/q2/food_price2.test
*** buyLotsOfFruit must compute the correct cost of the order
*** student result: "0.0"
*** correct result: "14.75"
*** FAIL: test_cases/q2/food_price3.test
*** buyLotsOfFruit must compute the correct cost of the order
*** student result: "0.0"
*** correct result: "6.4375"
*** Tests failed.
### Question q2: 0/1 ###
Question q3
===========
Welcome to shop1 fruit shop
Welcome to shop2 fruit shop
*** FAIL: test_cases/q3/select_shop1.test
*** shopSmart(order, shops) must select the cheapest shop
*** student result: "None"
*** correct result: "<FruitShop: shop1"
Welcome to shop1 fruit shop
Welcome to shop2 fruit shop
*** FAIL: test_cases/q3/select_shop2.test
*** shopSmart(order, shops) must select the cheapest shop
*** student result: "None"
*** correct result: "<FruitShop: shop2"
Welcome to shop1 fruit shop
Welcome to shop2 fruit shop
Welcome to shop3 fruit shop
*** FAIL: test_cases/q3/select_shop3.test
*** shopSmart(order, shops) must select the cheapest shop
*** student result: "None"
*** correct result: "<FruitShop: shop3"
*** Tests failed.
### Question q3: 0/1 ###
Finished at 23:39:51
Provisional grades
==================
Question q1: 0/1
Question q2: 0/1
Question q3: 0/1
------------------
Total: 0/3
For each of the three questions, this shows the results of that question's tests, the
questions grade, and a final summary at the end. Because you haven't yet solved the
questions, all the tests fail. As you solve each question you may find some tests pass
while other fail. When all tests pass for a question, you get full points.
Looking at the results for question 1, you can see that it has failed three tests with
the error message "add(a,b) must return the sum of a and b". The answer your code
gives is always 0, but the correct answer is different.
Question 1: Addition
Open addition.py and look at the definition of add:
def add(a, b):
"Return the sum of a and b"
"*** YOUR CODE HERE ***"
return 0
Modify add to return the sum of a and b, and re-run the autograder. You should now
see a passing result for Question 1.
Question 2: buyLotsOfFruit function
Add a buyLotsOfFruit(orderList) function to buyLotsOfFruit.py which
takes a list of (fruit,pound) tuples and returns the cost of your list. If there is some
fruit in the list that doesn't appear in fruitPrices it should print an error
message and return None. Please do not change the fruitPrices variable.
Run python autograder.py until question 2 passes all tests. Each test will confirm
that buyLotsOfFruit(orderList) returns the correct answer given various
possible inputs. For example, test_cases/q2/food_price1.test tests whether:
Cost of [('apples', 2.0), ('pears', 3.0), ('limes', 4.0)] is
12.25
Question 3: shopSmart function
Fill in the function shopSmart(orders,shops) in shopSmart.py, which takes
an orderList (like the kind passed in to FruitShop.getPriceOfOrder) and
a list of FruitShop and returns the FruitShop where your order costs the least
amount in total. Don't change the file name or variable names, please.
Run python autograder.py until Question 3 passes all tests. Each test will
confirm that shopSmart(orders,shops) returns the correct answer given
various possible inputs. For example, with the following variable definitions:
orders1 = [('apples',1.0), ('oranges',3.0)]
orders2 = [('apples',3.0)]
dir1 = {'apples': 2.0, 'oranges':1.0}
shop1 = shop.FruitShop('shop1',dir1)
dir2 = {'apples': 1.0, 'oranges': 5.0}
shop2 = shop.FruitShop('shop2',dir2)
shops = [shop1, shop2]
test_cases/q3/select_shop1.test tests whether:
shopSmart.shopSmart(orders1, shops) == shop1
and test_cases/q3/select_shop2.test tests whether:
shopSmart.shopSmart(orders2, shops) == shop2
To Submit Your Assignment
Submit all code files as one zip file on Moodle. Include all files in the original tutorial
directory, including both the files you modified and the files you did not modify.
Store the output of the autograder in a file using the command
python autograder.py myOutput
and include the output in what you submit to Moodle. Print out only the files you
modified, and the output of the autograder. Staple these pages together, and turn
them in at the beginning of class on Wednesday, September 3. Your grade on this
assignment will be the grade that the autograder returns, so it’s important to get
your code working.