This community-built FAQ covers the “A Breadth of Fresh Neighbors” exercise from the lesson “Graph Search: Python”.
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FAQs on the exercise A Breadth of Fresh Neighbors
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Hello Codecademy Team, I am finding it difficult to implement DFS and BFS algorithms.
I implemented it but I don’t know what my code does.
Can u please add video at the end of instructions. so that students like me will be able to grasp difficult concepts quickly.
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Seconded.
Looking up BFS on other sites, theirs is far more simple and easy to follow. You simply populate and then depopulate the queue.
This algorithm uses a vertex and path list to build a path and a queue and I am very, very lost.
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Hello. It’d be nice if this exercise didn’t refuse to accept “if not neighbor in visited:” as opposed to “if neighbor not in visited:” when they are the exact same thing 
Especially since I’m 99% sure I did it that way on the previous one and it did accept it.
I’m not an expert, but I think there IS a difference between the two expressions. When you code not neighbor in visited, you may be saying: "When the value which isn’t None, (or when it’s None, I’m not sure), is in visited.
Totally agreed! I finished the section but don’t feel like I understood it completely although I went through it very slowly in 3 hours. I have to check via other sites to fully understand it.
They are equivalent, so this is a bug in the Codecademy assignment evaluator. I’m not going to bother filing a bug report since they don’t fix anything anyhow. lol.
Incidentally, there is a way around it: wait until it has evaluated it in Step 1 then change it back to your syntax.
