add dtype parameter to PauliSumOp.to_list

Qiskit · Oct 13, 2022 · 04ad868 · 04ad868
1 parent af82b4d
commit 04ad868
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diff --git a/qiskit/opflow/primitive_ops/pauli_sum_op.py b/qiskit/opflow/primitive_ops/pauli_sum_op.py
@@ -433,6 +433,7 @@ def from_list(
         cls,
         pauli_list: List[Tuple[str, complex]],
         coeff: Union[complex, ParameterExpression] = 1.0,
+        dtype: type = complex,
     ) -> "PauliSumOp":
         """Construct from a pauli_list with the form [(pauli_str, coeffs)]
 
@@ -443,7 +444,7 @@ def from_list(
         Returns:
             The PauliSumOp constructed from the pauli_list.
         """
-        return cls(SparsePauliOp.from_list(pauli_list), coeff=coeff)
+        return cls(SparsePauliOp.from_list(pauli_list, dtype=dtype), coeff=coeff)
 
     def is_zero(self) -> bool:
         """

diff --git a/test/python/opflow/test_pauli_sum_op.py b/test/python/opflow/test_pauli_sum_op.py
@@ -305,6 +305,11 @@ def test_from_list(self):
         )
         self.assertEqual(target, expected)
 
+        a = Parameter("a")
+        target = PauliSumOp.from_list([("X", 0.5 * a), ("Y", -0.5j * a)], dtype=object)
+        expected = PauliSumOp(SparsePauliOp.from_list([("X", 0.5 * a), ("Y", -0.5j * a)], dtype=object)
+        self.assertEqual(target, expected)
+
     def test_matrix_iter(self):
         """Test PauliSumOp dense matrix_iter method."""
         labels = ["III", "IXI", "IYY", "YIZ", "XYZ", "III"]