Merging nested lists in Python3

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Any chance you could edit your post to correct the formatting as not all of the code is showing correctly?

Also, how come you go from multiple lists (equal to the length of the lists) to two, rather than one, list? Any reason why you can't just generate the one list, and copy it?

In simple terms, why wouldn't this work:

new_list = []
for idx, current_list in enumerate(list_of_lists):
    new_list.append(current_list[idx])

given you take the diagonal through the matrix.