Hi, I'm doing Python exercises and I need to write a function to flat nested lists as this one:
[[1,2,3],4,5,[6,[7,8]]] To the result: [1,2,3,4,5,6,7,8] So I searched for example code and I found this one that uses recursion (that I don't understand): def flatten(l): ret = [] for i in l: if isinstance(i, list) or isinstance(i, tuple): ret.extend(flatten(i)) #How is flatten(i) evaluated? else: ret.append(i) return ret So I know what recursion is, but I don't know how is flatten(i) evaluated, what value does it returns? Thank you -- https://mail.python.org/mailman/listinfo/python-list