Computer Science/Lesson 3 Flow, Data, Iteration/Advanced Python Code Challenges: Lists/Double_index

What does the problem mean when it says “If index is not a valid index”? What is too big? More details would be helpful.

# this list has a length of 3
# the indexes start at 0 and go up to 2
lst_of_odd_numbers = [3, 5, 7]

# if you were to try this line you would get an error as the last index is 2

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