Because SymEngine 0.10, undoing 8456

qiskit/circuit/parameterexpression.py

@@ -521,24 +521,17 @@ def __eq__(self, other):
     def is_real(self):
         """Return whether the expression is real"""
 
-        # workaround for symengine behavior that const * (0 + 1 * I) is not real
-        # see https://github.com/symengine/symengine.py/issues/414
-        if _optionals.HAS_SYMENGINE and self._symbol_expr.is_real is None:
-            symbol_expr = self._symbol_expr.evalf()
-        else:
-            symbol_expr = self._symbol_expr
-
-        if not symbol_expr.is_real and symbol_expr.is_real is not None:
+        if not self._symbol_expr.is_real and self._symbol_expr.is_real is not None:
             # Symengine returns false for is_real on the expression if
             # there is a imaginary component (even if that component is 0),
             # but the parameter will evaluate as real. Check that if the
             # expression's is_real attribute returns false that we have a
             # non-zero imaginary
             if _optionals.HAS_SYMENGINE:
-                if symbol_expr.imag == 0.0:
+                if self.symbol_expr.imag == 0.0:
                     return True
             return False
-        return symbol_expr.is_real
+        return self.symbol_expr.is_real
 
     def sympify(self):
         """Return symbolic expression as a raw Sympy or Symengine object.

requirements.txt

@@ -7,7 +7,7 @@ sympy>=1.3
 dill>=0.3
 python-dateutil>=2.8.0
 stevedore>=3.0.0
-symengine>=0.9 ; platform_machine == 'x86_64' or platform_machine == 'aarch64' or platform_machine == 'ppc64le' or platform_machine == 'amd64' or platform_machine == 'arm64'
+symengine>=0.10 ; platform_machine == 'x86_64' or platform_machine == 'aarch64' or platform_machine == 'ppc64le' or platform_machine == 'amd64' or platform_machine == 'arm64'
 shared-memory38;python_version<'3.8'
 typing-extensions; python_version < '3.8'
 singledispatchmethod; python_version < '3.8'