How to output result of set cover algorithm as integers in python instead of 'None'?

Question

I am having problems getting the output of a function to be displayed properly.

As can be seen in this image, what should be in place of the 'None' should be integers. The first, for example should output (1,2).

This issue seems to be with creating subsets from a string.

my_other_lines = str(other_lines)
print(my_other_lines)
setOfother_lines = set(tuple(i) for i in other_lines)
print(setOfother_lines)
universe = set(range(1, 7))
subsets = [set(setOfother_lines)]
cover = set_cover(universe, subsets, 1)
print(cover)

This is the snippet of code that is supposed to output the results of a set_cover function.

For context, here is the set_cover function

def set_cover(universe, subsets, k):
    # Find family of subsets that covers the universal set 
    k_count = 0
    elements = set(e for s in subsets for e in s)
    # Checks what subsets cover the universe
    if elements != universe:
        return None
    # Initializing elements covered
    covered = set()
    cover = []
    # Adds subsets with most uncovered points
    while (covered != elements) and (k_count < k):
        ##print(k_count)
        subset = max(subsets, key=lambda s: len(s - covered))
        cover.append(subset)
        covered |= subset
        k_count = k_count+1
    return cover