from collections import Counter
d = {(1, 3): 14, (1, 4): 13, (1, 2): 10, (11, 11): 19, (3, 1): 50, (4, 1): 5}
r = sum((Counter({frozenset(k): v}) for k, v in list(d.items())), Counter())
Python: Add Values and Remove Entry for Tuple Permutations in a Dictionary