When I try to submit the assignment “Programming Assignment: Retail sales - Expanding your analysis” in Module 2 of the Python for Data Analytics course, I get an error (see screenshot below):
Because of this, I don’t get the 10 points for ex10 (see the next screenshot):
Hi! Are you matching the expected output for that exercise? If so, can you try resubmitting it. Sometimes, that error is just a glitch. Also, please let me know if you deleted any code cell by any chance. Thanks.
Thank you Chris.
It was my mistake. I have worked out on code in the # GRADED CELL and it match the Expected output perfectly! 
It just my “coding experience" is growing. I needed to go all the third module through and make step back to realise I made mistake in a # GRADED CELL
But also now I have another questiona about this Assignment.
I did not gain points for Ex.5 It says “Failed test case: You haven’t found the correct product_counts in Ex. 5. Please check your answers."
But I am matching the Expected Output:
So what could be the cause I did not earn any points for ex5?
The grader uses entirely different tests.
Passing the tests in the notebook does not prove your code is perfect.
So how can I find out my code mistake?
First, review your code and see if there is anything you’ve done that relies on global variables or fixed constant values, within the notebook. The grader won’t provide those.
I have not taken this course and (thus) am not familiar with that assignment. But notice that your values are not sorted in the same order as the “Expected Values”, even though the numeric values are correct. Perhaps the grader cares about the order? Why did yours come out in a different order?
You are absolutely right! Doing exercise I just paid attention on figures and did not paid attention on sorting! Thnx for your help.
Will go and investigate further…
PS
Sorry for stupid questions…
This tell me I need to be more careful when checking the results in the future.
It may turn out that the sort order doesn’t matter, but it’s different so it seems worth understanding why it came out differently.
Anyway I am grateful you gave me a reason to investigate, maybe I will find another mistake. 
