Close #9272: autodoc: Render enum values for the default argument value better

CHANGES

@@ -35,6 +35,7 @@ Features added
 * #8061, #9218: autodoc: Support variable comment for alias classes
 * #3014: autodoc: Add :event:`autodoc-process-bases` to modify the base classes
   of the class definitions
+* #9272: autodoc: Render enum values for the default argument value better
 * #3257: autosummary: Support instance attributes for classes
 * #9129: html search: Show search summaries when html_copy_source = False
 * #9120: html theme: Eliminate prompt characters of code-block from copyable

sphinx/util/inspect.py

@@ -442,21 +442,24 @@ def object_description(object: Any) -> str:
                      (object_description(key), object_description(object[key]))
                      for key in sorted_keys)
             return "{%s}" % ", ".join(items)
-    if isinstance(object, set):
+    elif isinstance(object, set):
         try:
             sorted_values = sorted(object)
         except TypeError:
             pass  # Cannot sort set values, fall back to generic repr
         else:
             return "{%s}" % ", ".join(object_description(x) for x in sorted_values)
-    if isinstance(object, frozenset):
+    elif isinstance(object, frozenset):
         try:
             sorted_values = sorted(object)
         except TypeError:
             pass  # Cannot sort frozenset values, fall back to generic repr
         else:
             return "frozenset({%s})" % ", ".join(object_description(x)
                                                  for x in sorted_values)
+    elif isinstance(object, enum.Enum):
+        return "%s.%s" % (object.__class__.__name__, object.name)
+
     try:
         s = repr(object)
     except Exception as exc:

tests/test_util_inspect.py

@@ -10,6 +10,7 @@
 
 import ast
 import datetime
+import enum
 import functools
 import sys
 import types
@@ -516,6 +517,14 @@ def __repr__(self):
     assert "<CustomType(2)>: 2" in description
 
 
+def test_object_description_enum():
+    class MyEnum(enum.Enum):
+        FOO = 1
+        BAR = 2
+
+    assert inspect.object_description(MyEnum.FOO) == "MyEnum.FOO"
+
+
 def test_getslots():
     class Foo:
         pass