commiting suggested changes with updated email to clear CLA issues

releasenotes/notes/added-sign-feature-parameterexpression-57693dd69103dc8c.yaml

@@ -1,16 +1,18 @@
 ---
 features:
   - |
-    Introduced a new feature that adds support for calculating the sign of the Parameter of the value of an expression of a Parameter class.
-    Instead of using numpy or other libraries, the user can use the instance of the ParameterExpression class to calculate the sign.
+    Added support for expressing the sign of a :class: 'ParameterExpression'
+    Instead of assigning a concrete value and using ''numpy.sign'' or other library functions, the user can use the instance of the ParameterExpression
+    class to calculate the sign and can work with the sign before the expression is fully assigned.
 
     It can be used as follows::
 
-    from qiskit.circuit import Parameter
+      from qiskit.circuit import Parameter
 
-    b = Parameter("phi")
-    sign_value = b.sign()
-    print("sign of Parameter is: ", sign_value)
+      b = Parameter("phi")
+      sign_value = b.sign()
+      print("sign of an unassigned Parameter is: ", sign_value)
+      print("Sign of a Parameter assigned to -3 is: ", sign_value.assign(b,-3))
 
-    Refer to ` #10360 <https://github.com/Qiskit/qiskit-terra/issues/10360>`__ for more details.
+    Refer to ' #10360<https://github.com/Qiskit/qiskit-terra/issues/10360>'__ for more details.
 

test/python/circuit/test_parameters.py

@@ -945,6 +945,8 @@ def test_sign_of_parameter(self):
         b = Parameter("phi")
         sign_of_parameter = b.sign()
         self.assertEqual(sign_of_parameter.assign(b, -3), -1)
+        self.assertEqual(sign_of_parameter.assign(b, 2), 1)
+        self.assertEqual(sign_of_parameter.assign(b, 0), 0)
 
     @combine(target_type=["gate", "instruction"], parameter_type=["numbers", "parameters"])
     def test_decompose_propagates_bound_parameters(self, target_type, parameter_type):