diff list by set part 2

def list_diff(list_a, list_b):
    set_a = set([item.__repr__() for item in list_a])
    set_b = set([item.__repr__() for item in list_b])
    set_int = set_a.intersection(set_b)
    return {'---':[eval(item) for item in list(set_a - set_int)],
            '===':[eval(item) for item in list(set_int)],
            '+++':[eval(item) for item in list(set_b - set_int)]}

In [2]: a = [{'x':123},'Hello World', 789]
In [3]: b = ['Hello World', 456, {'y':567}]
In [4]: list_diff(a,b)
Out[4]: {'+++': [{'y': 567}, 456], '---': [{'x': 123}, 789], '===': ['Hello World']}