Write documentation for structural API module

src/ifcopenshell-python/ifcopenshell/api/structural/edit_structural_connection_cs.py

@@ -18,22 +18,34 @@
 
 
 class Usecase:
-    def __init__(self, file, **settings):
+    def __init__(self, file, structural_item=None, axis=None, ref_direction=None):
+        """Edits the coordinate system of a structural connection
+
+        :param structural_item: The IfcStructuralItem you want to modify.
+        :type structural_item: ifcopenshell.entity_instance.entity_instance
+        :param axis: The unit Z axis vector defined as a list of 3 floats.
+            Defaults to [0., 0., 1.].
+        :type axis: list[float]
+        :param ref_direction: The unit X axis vector defined as a list of 3
+            floats. Defaults to [1., 0., 0.].
+        :type ref_direction: list[float]
+        :return: None
+        :rtype: None
+        """
         self.file = file
-        self.settings = {"structural_item": None, "axis": [0.0, 0.0, 1.0], "ref_direction": [1.0, 0.0, 0.0]}
-        for key, value in settings.items():
-            self.settings[key] = value
+        self.settings = {
+            "structural_item": structural_item,
+            "axis": axis or [0.0, 0.0, 1.0],
+            "ref_direction": ref_direction or [1.0, 0.0, 0.0],
+        }
 
     def execute(self):
         if self.settings["structural_item"].ConditionCoordinateSystem is None:
             point = self.file.createIfcCartesianPoint((0.0, 0.0, 0.0))
             ccs = self.file.createIfcAxis2Placement3D(point, None, None)
             self.settings["structural_item"].ConditionCoordinateSystem = ccs
-            print(ccs)
 
         ccs = self.settings["structural_item"].ConditionCoordinateSystem
-        print("use case")
-        print(ccs)
         if ccs.Axis and len(self.file.get_inverse(ccs.Axis)) == 1:
             self.file.remove(ccs.Axis)
         ccs.Axis = self.file.createIfcDirection(self.settings["axis"])