Add a free alias for parameters that are not fixed

src/easyscience/Objects/Variable.py

@@ -503,6 +503,7 @@ def __init__(
         min: Optional[numbers.Number] = -np.inf,
         max: Optional[numbers.Number] = np.inf,
         fixed: Optional[bool] = False,
+        free: Optional[bool] = True,
         **kwargs,
     ):
         """
@@ -721,6 +722,14 @@ def fixed(self, value: bool):
             raise ValueError
         self._fixed = value
 
+    @property
+    def free(self) -> bool:
+        return not self.fixed
+
+    @free.setter
+    def free(self, value: bool) -> None:
+        self.fixed = not value
+
     @property
     def error(self) -> float:
         """

src/easyscience/Objects/new_variable/parameter.py

@@ -49,6 +49,7 @@ def __init__(
         min: Optional[numbers.Number] = -np.inf,
         max: Optional[numbers.Number] = np.inf,
         fixed: Optional[bool] = False,
+        free: Optional[bool] = True,
         unique_name: Optional[str] = None,
         description: Optional[str] = None,
         url: Optional[str] = None,
@@ -301,6 +302,14 @@ def fixed(self, fixed: bool) -> None:
             raise ValueError(f'{fixed=} must be a boolean. Got {type(fixed)}')
         self._fixed = fixed
 
+    @property
+    def free(self) -> bool:
+        return not self.fixed
+
+    @free.setter
+    def free(self, value: bool) -> None:
+        self.fixed = not value
+
     @property
     def bounds(self) -> Tuple[numbers.Number, numbers.Number]:
         """

tests/unit_tests/Objects/new_variable/test_parameter.py

@@ -328,6 +328,7 @@ def test_as_data_dict(self, clear, parameter: Parameter):
             "min": 0,
             "max": 10,
             "fixed": False,
+            "free": True,
             "description": "description",
             "url": "url",
             "display_name": "display_name",