Change ParameterExpression __eq__ to sympy equals()

qiskit/circuit/parameterexpression.py

@@ -383,10 +383,9 @@ def __eq__(self, other):
         Returns:
             bool: result of the comparison
         """
-        from sympy import srepr
         if isinstance(other, ParameterExpression):
             return (self.parameters == other.parameters
-                    and srepr(self._symbol_expr) == srepr(other._symbol_expr))
+                    and self._symbol_expr.equals(other._symbol_expr))
         elif isinstance(other, numbers.Number):
             return (len(self.parameters) == 0
                     and complex(self._symbol_expr) == other)

test/python/circuit/test_parameters.py

@@ -1546,6 +1546,14 @@ def test_parameter_expression_equal_to_identical(self):
 
         self.assertEqual(expr1, expr2)
 
+    def test_parameter_expression_equal_floats_to_ints(self):
+        """Verify an expression with float and int is identical."""
+        theta = Parameter('theta')
+        expr1 = 2.0 * theta
+        expr2 = 2 * theta
+
+        self.assertEqual(expr1, expr2)
+
     def test_parameter_expression_not_equal_if_params_differ(self):
         """Verify expressions not equal if parameters are different."""
         theta1 = Parameter('theta')