Fix an error with enums, fixes #1675

jedi/plugins/stdlib.py

@@ -819,7 +819,8 @@ def get_metaclass_filters(func):
                     and metaclass.get_root_context().py__name__() == 'enum':
                 filter_ = ParserTreeFilter(parent_context=cls.as_context())
                 return [DictFilter({
-                    name.string_name: EnumInstance(cls, name).name for name in filter_.values()
+                    name.string_name: EnumInstance(cls, name).name
+                    for name in filter_.values()
                 })]
         return func(cls, metaclasses, is_instance)
     return wrapper
@@ -837,6 +838,14 @@ class EnumInstance(LazyValueWrapper):
         return ValueName(self, self._name.tree_name)
 
     def _get_wrapped_value(self):
+        n = self._name.string_name
+        if n.startswith('__') and n.endswith('__') or self._name.api_type == 'function':
+            inferred = self._name.infer()
+            if inferred:
+                return next(iter(inferred))
+            o, = self.inference_state.builtins_module.py__getattribute__('object')
+            return o
+
         value, = self._cls.execute_with_values()
         return value
 

test/test_inference/test_signature.py

@@ -340,3 +340,20 @@ def test_overload(Script, code):
     x1, x2 = Script(code, path=os.path.join(dir_, 'foo.py')).get_signatures()
     assert x1.to_string() == 'with_overload(x: int, y: int) -> float'
     assert x2.to_string() == 'with_overload(x: str, y: list) -> float'
+
+
+def test_enum(Script):
+    script = Script('''\
+        from enum import Enum
+
+        class Planet(Enum):
+            MERCURY = (3.303e+23, 2.4397e6)
+            VENUS = (4.869e+24, 6.0518e6)
+
+            def __init__(self, mass, radius):
+                self.mass = mass  # in kilograms
+                self.radius = radius  # in meters
+
+        Planet.MERCURY''')
+    completion, = script.complete()
+    assert not completion.get_signatures()