Fix 3-col calculator labelling and add lint

migrate.py

@@ -187,6 +187,11 @@ def process():
             except:
                 pass
 
+        # Give 3-col calculators honest display names instead of "A to B"
+        if c_type in ['3col', '3col-mul'] and split_conversion_name(display_name):
+            op = '*' if c_type == '3col-mul' else '/'
+            display_name = f"{in1} {op} {in2}"
+
         # Avoid escaping single quotes by using JSON or dict
         entry = {
             'slug': slug,
@@ -200,11 +205,16 @@ def process():
         # Determine labels
         labels = {'in1': in1, 'in2': in2}
         if c_type in ['3col', '3col-mul']:
-            # generic 3rd label
-            if 'watts' in slug and 'amps' in slug: labels['in3'] = 'Volts'
-            elif 'lumens' in slug: labels['in3'] = 'Area (sq m)'
-            elif 'moles' in slug: labels['in3'] = 'Molar Mass'
-            else: labels['in3'] = 'Result'
+            # generic 3rd label; make it descriptive instead of the vague "Result"
+            if 'watts' in slug and 'amps' in slug:
+                labels['in3'] = 'Volts'
+            elif 'lumens' in slug:
+                labels['in3'] = 'Area (sq m)'
+            elif 'moles' in slug:
+                labels['in3'] = 'Molar Mass'
+            else:
+                op = '*' if c_type == '3col-mul' else '/'
+                labels['in3'] = f"{in1} {op} {in2}"
 
         if custom_labels:
             labels = custom_labels