comment: AI suggestions

Author: aignas

python/private/pypi/hub_builder.bzl

@@ -210,10 +210,14 @@ def _add_extra_aliases(self, extra_hub_aliases):
 def _diff_dict(first, second):
     """A simple utility to shallow compare dictionaries.
 
-    to return a list of (key, value of first, value of second)
-    """
-    keys = {}
+    Args:
+        first: The first dictionary to compare.
+        second: The second dictionary to compare.
 
+    Returns:
+        A dictionary containing the differences, with keys "common", "different",
+        "extra", and "missing", or None if the dictionaries are identical.
+    """
     missing = {}
     extra = {
         key: value
@@ -224,7 +228,6 @@ def _diff_dict(first, second):
     different = {}
 
     for key, value in first.items():
-        keys[key] = None
         if key not in second:
             missing[key] = value
         elif value == second[key]: