Hi,

I am very new to Python Programming. I have just finished part 1 of this problem. However, I am stuck at part 2. I am having hard time trying to figure out how to print out error message and stop the program whenever the current average price is lower than the previous one. Could you please give me a suggestion for part 2? I have tried while loop but it did not work. Thank you!

Note: I have only learned up to branching and looping in order to solve this problem.