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

src/ifcopenshell-python/ifcopenshell/api/constraint/add_metric.py

@@ -1,5 +1,6 @@
 import ifcopenshell
 
+
 class Usecase:
     def __init__(self, file, **settings):
         self.file = file
@@ -10,11 +11,14 @@ class Usecase:
             self.settings[key] = value
 
     def execute(self):
-        metric = self.file.create_entity("IfcMetric", **{
-            "Name": "Unnamed",
-            "ConstraintGrade": "NOTDEFINED",
-            "Benchmark": "EQUALTO",
-        })
+        metric = self.file.create_entity(
+            "IfcMetric",
+            **{
+                "Name": "Unnamed",
+                "ConstraintGrade": "NOTDEFINED",
+                "Benchmark": "EQUALTO",
+            }
+        )
         if self.settings["objective"]:
             benchmark_values = list(self.settings["objective"].BenchmarkValues or [])
             benchmark_values.append(metric)