code: def test_SDM_charpoly():
      A = SDM(
          {0: {0: ZZ(1), 1: ZZ(2)}, 1: {0: ZZ(3), 1: ZZ(4)}}, (2, 2), ZZ
      )
      assert A.charpoly() == [ZZ(1), ZZ(-5), ZZ(-2)]
  
imports: from itertools import product
  from sympy.core.singleton import S
  from sympy.external.gmpy import GROUND_TYPES
  from sympy.testing.pytest import raises
  from sympy.polys.domains import QQ, ZZ, EXRAW
  from sympy.polys.matrices.sdm import SDM
  from sympy.polys.matrices.ddm import DDM
  from sympy.polys.matrices.exceptions import DMBadInputError, DMDomainError, DMShapeError
label_desc: Use image node_id 36 for calling a global function with example usage: test_SDM_charpoly() without return types