I don't fully understand the code - python coding challenges

I don't fully understand the code

Question related to mission The Flat Dictionary

I don't quite follow: 1. what means the line stack = [((), dictionary)] Is it tuple inside list? Why? 2. what means the line result["/".join((path + (k,)))] = v? variable "result" is assigned nothing, but it is returned.

Created at: 2014/12/02 18:29; Updated at: 2014/12/12 23:24

task.flatten-dict

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