You can now add and edit context dependent units including dimensional exponents

src/ifcopenshell-python/ifcopenshell/api/unit/add_context_dependent_unit.py

@@ -0,0 +1,14 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"unit_type": "USERDEFINED", "name": "THINGAMAJIG", "dimensions": (0, 0, 0, 0, 0, 0, 0)}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        return self.file.create_entity(
+            "IfcContextDependentUnit",
+            Dimensions=self.file.createIfcDimensionalExponents(*self.settings["dimensions"]),
+            UnitType=self.settings["unit_type"],
+            Name=self.settings["name"],
+        )