Python List Comprehension: Common number tuples

common_tuples.py

'''
Produce a list of tuples consisting of only the matching numbers in these lists list_a = [1, 2, 3,4,5,6,7,8,9], list_b = [2, 7, 1, 12].  Result would look like (4,4), (12,12)
'''
list_a = [1, 2, 3,4,5,6,7,8,9]
list_b = [2, 7, 1, 12]

result = [(a, b) for a in list_a for b in list_b if a == b]
print(result)

list_a = 1,2,3,4,5,6,7,8,9
list_b = 2, 7, 1, 12
matches = [(x,x) for x in list_a if x in list_b ]
print(matches)