A list in Python can contain nested lists. The degree of nesting need not be uniform For instance 1,2,3,4,5,6 is valid. Write a Python function flatten(l) that takes a nonempty list of lists and returns a simple list of all the elements in the nested lists, flattened out You can make use of the following function that returns. True if its input is of type list.

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Python Programming Code to copy Function to return flat list def fla... View the full answer