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APT Quiz

Link to APT Quiz page

Regrades

If you have concerns about an item that was graded (lab, apt or assignment), you have one week after the grade is posted to fill out the regrade form here.

APTs

See below for hints on what to do if your APT doesn't run.

For each problem in an APT set, complete these steps by the due date

• first test it and get it working correctly using the Test link
• then submit the code for grading using the Submit link
• check your grade on the grade code page by clicking on check submissions
• then fill out the README form for each APT you do to give us feedback on that problem and to certify that you understand the code for that APT.

In solving APTs, your program should work for all cases, not just the test cases we provide. We may test your program on additional data.

We may do some APTs partially in class or lab, but you still have to do them and submit them. There will usually be extra apts listed. You can do more than required to challenge yourself. We do notice if you do more APTs than those required. If you do extra APTs, they still have to be turned in on the due date.

Problems Running an APT?

Here are some suggestions if your APT does not run.

• Make sure you have the correct file name, including case.
• Make sure you have the correct def statement, the first line of your method definition. Strongly recommend you cut and paste it.
• If you don't get any red or green boxes, try commenting out the code for your function and just return something simple, return 1 if the return type is an integer, return "bogus" if the return type is a string. You won't have the correct answer but you should have the red and green boxes.

• Do you have a return statement? Do you have a return at the end of the method? Maybe you have an if with return statements but not one at the very end just in case one of the other cases don't match. Put a return at the end of your method (that is not inside an if or for) with a value you don't expect to return such as return "bogus" if you are suppose to return a string.
• Do you have the correct type of value to return? If the function is suppose to return an integer, are you returning an integer?

• If you are getting timelimit exceeded and have tried all the things above, put in a print statement at the top of your function such as

    print "starting function"
  

  When you run it, does that show up? Note it will show up for each sample input it runs on. If it does show up, try adding in other print statements to see if they show up.
• If your output looks exactly like the output is suppose to but is RED instead of GREEN, then you may have an extra blank that doesn't show up. The string "frog" and "frog " are different, the first is of length 4 and the second is of length 5. If the string you are returning is the variable answer, instead return the string "X"+answer+"X". You won't have the correct answer, so you will get all reds, but you might notice extra blanks on either or both ends of your answer.

• If you are getting red and green boxes but cannot figure out what is wrong with your code, then try copying your code into Python Tutor. You will also need to add a statement to call the function with some input. Then you can trace through it in Python Tutor and see the values of variables. If you have long statements like:

   
  x = stuff.lower().find('x')
  

  Break them into more lines and add more variables so you can see the intermediate results. Such as:

  temp = stuff.lower()
  x = temp.find('x')