Boy do i have the perfect link for you. This should clear up your issue and help you pass this test. If this does help you i just request that you mark this post as the solution to this topic that you have created. Happy Coding!
P.S. storing the entire chart in one variable helped me pass some tests near the end. Example: print(my_chart_variable) where i had concatenated or joined everything together throughout my code working left to right, and then top to bottom.