from dimod import ExactSolver
sampler = ExactSolver()

Q = {('x', 'x'): -1, ('y', 'y'): -1, ('x', 'y'): 2}

response = sampler.sample_qubo(Q)
for datum in response.data(['sample', 'energy']):   
  print(datum.sample, "Energy: ", datum.energy)

#output:
#({'y': 0, 'x': 1}, 'Energy: ', -1.0)
#({'y': 1, 'x': 0}, 'Energy: ', -1.0)
#({'y': 0, 'x': 0}, 'Energy: ', 0.0)
#({'y': 1, 'x': 1}, 'Energy: ', 0.0)