Fix displaying param names for classes.

jedi/evaluate/instance.py

@@ -366,6 +366,11 @@ class SelfNameFilter(InstanceClassFilter):
                 if name.is_definition() and self._access_possible(name):
                     yield name
                     continue
+
+
+
+
+
                     init_execution = self.context.get_init_function()
                     # Hopefully we can somehow change this.
                     if init_execution is not None and \

jedi/evaluate/representation.py

@@ -208,6 +208,17 @@ class ClassContext(use_metaclass(CachedMetaClass, context.TreeContext)):
                 return names
         return []
 
+    def get_param_names(self):
+        for name in self.get_function_slot_names('__init__'):
+            for context_ in name.infer():
+                try:
+                    method = context_.get_param_names
+                except AttributeError:
+                    pass
+                else:
+                    return method()[:-1]
+        return []
+
     @property
     def name(self):
         return ContextName(self, self.classdef.name)
@@ -277,12 +288,8 @@ class FunctionContext(use_metaclass(CachedMetaClass, context.TreeContext)):
         return ContextName(self, self.funcdef.name)
 
     def get_param_names(self):
-        anon = AnonymousFunctionExecution(
+        function_execution = self.get_function_execution()
-            self.evaluator,
+        return [ParamName(function_execution, param.name) for param in self.funcdef.params]
-            self.parent_context,
-            self
-        )
-        return [ParamName(anon, param.name) for param in self.funcdef.params]
 
 
 class FunctionExecutionContext(Executed):