Some of your programming assignments in this course will be automatically graded. To get you familiarized with this process and with Python, please code, test, and submit solutions for three questions.
You can download all of the files for this homework as a zip archive: 0-tutorial.zip. Unzip this file and examine its contents:
[name.no@stdlinux ~]$ unzip 0-tutorial.zip [name.no@stdlinux ~]$ cd 0-tutorial [name.no@stdlinux ~/0-tutorial]$ ls addition.py autograder.py buyLotsOfFruit.py grading.py projectParams.py shop.py shopSmart.py testClasses.py testParser.py test_cases textDisplay.py tutorialTestClasses.py util.py
This contains a number of files you'll edit or run:
addition.py: source file for question 1buyLotsOfFruit.py: source file for question 2shop.py: source file for question 3shopSmart.py: source file for question 3autograder.py: autograding script (see below)and others you can ignore:
test_cases: directory contains the test cases for each questiongrading.py: autograder codetestClasses.py: autograder codetextDisplay.py: autograder codeutil.py: autograder codetutorialTestClasses.py: test classes for this particular projectprojectParams.py: project parametersThe command python autograder.py grades your solution to all three problems. Running it before editing any files produces a page or two of output:
[name.no@stdlinux ~/0-tutorial]$ python autograder.py Starting on 1-21 at 23:39:51 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 Your grades are NOT yet registered. To register your grades, make sure to follow your instructor's guidelines to receive credit on your project.
For each of the three programming questions, this shows the results of that question's tests, the question's 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 marks.
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. We'll fix that in the next step.
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
The tests called this with a and b set to different values, but the code always returned zero. Modify this definition to read:
def add(a, b):
"Return the sum of a and b"
print "Passed a=%s and b=%s, returning a+b=%s" % (a,b,a+b)
return a+b
Now rerun the autograder (omitting the results for questions 2 and 3):
[name.no@stdlinux ~/0-tutorial]$ python autograder.py -q q1 Starting on 1-21 at 23:52:05 Question q1 =========== Passed a=1 and b=1, returning a+b=2 *** PASS: test_cases/q1/addition1.test *** add(a,b) returns the sum of a and b Passed a=2 and b=3, returning a+b=5 *** PASS: test_cases/q1/addition2.test *** add(a,b) returns the sum of a and b Passed a=10 and b=-2.1, returning a+b=7.9 *** PASS: test_cases/q1/addition3.test *** add(a,b) returns the sum of a and b ### Question q1: 1/1 ### Finished at 23:41:01 Provisional grades ================== Question q1: 1/1 Question q2: 0/1 Question q3: 0/1 ------------------ Total: 1/3
You now pass all tests, getting full marks for question 1. Notice the new lines "Passed a=..." which appear before "*** PASS: ...". These are produced by the print statement in add. You can use print statements like that to output information useful for debugging. You can also run the autograder with the option --mute to temporarily hide such lines, as follows:
[name.no@stdlinux ~/0-tutorial]$ python autograder.py -q q1 --mute Starting on 1-22 at 14:15:33 Question q1 =========== *** PASS: test_cases/q1/addition1.test *** add(a,b) returns the sum of a and b *** PASS: test_cases/q1/addition2.test *** add(a,b) returns the sum of a and b *** PASS: test_cases/q1/addition3.test *** add(a,b) returns the sum of a and b ### Question q1: 1/1 ###
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 which 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 and you get full marks. 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 12.25Fill 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. Note that we will provide the shop.py implementation as a "support" file, so you don't need to submit yours.
Run python autograder.py until question 3 passes all tests and you get full marks. 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 code for Questions 1-3, please zip up addition.py, buyLotsOfFruit.py, and shopSmart.py, and submit the zip file via Carmen.