FAQ: Collections - Deque

This community-built FAQ covers the “Deque” exercise from the lesson “Collections”.

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This exercise can be found in the following Codecademy content:

Learn Intermediate Python 3

FAQs on the exercise Deque

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My question on this lesson is with respect to checkpoint 2 " Using a for loop, read each item from csv_data . On each iteration, if the item is marked as important, append it to the front of supplies_deque , otherwise append it to the end."

I created my solution and passed the checkpoint but ran into issues later in the lesson. When re-working this exercise and reading the hints I found this:

“Make sure to convert the data to a tuple when appending using tuple() .”

This step is not mentioned anywhere in the instructions and I can’t sort out why it is required. Any help would be great, thank you!