Run black, and add black to a "qa" target to make it a standardised process.

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

@@ -11,7 +11,7 @@ class Usecase:
             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)
@@ -20,4 +20,4 @@ class Usecase:
         ccs.Axis = self.file.createIfcDirection(self.settings["axis"])
         if ccs.RefDirection and len(self.file.get_inverse(ccs.RefDirection)) == 1:
             self.file.remove(ccs.RefDirection)
-        ccs.RefDirection = self.file.createIfcDirection(self.settings["ref_direction"])
+        ccs.RefDirection = self.file.createIfcDirection(self.settings["ref_direction"])