Some changes to get stubs working better for mixed objects

jedi/evaluate/compiled/mixed.py

@@ -19,6 +19,7 @@ from jedi.evaluate.helpers import execute_evaluated
 from jedi.evaluate.compiled.getattr_static import getattr_static
 from jedi.evaluate.compiled.access import compiled_objects_cache
 from jedi.evaluate.compiled.context import create_cached_compiled_object
+from jedi.evaluate.gradual.conversion import to_stub
 
 
 class MixedObject(object):
@@ -83,9 +84,7 @@ class MixedName(compiled.CompiledName):
         access_handle = self.parent_context.access_handle
         # TODO use logic from compiled.CompiledObjectFilter
         access_handle = access_handle.getattr(self.string_name, default=None)
-        return ContextSet([
-            _create(self._evaluator, access_handle, parent_context=self.parent_context)
-        ])
+        return _create(self._evaluator, access_handle, parent_context=self.parent_context)
 
     @property
     def api_type(self):
@@ -198,7 +197,7 @@ def _create(evaluator, access_handle, parent_context, *args):
 
     result = _find_syntax_node_name(evaluator, access_handle)
     if result is None:
-        return compiled_object
+        return ContextSet([compiled_object])
 
     module_node, tree_node, file_io, code_lines = result
 
@@ -228,9 +227,11 @@ def _create(evaluator, access_handle, parent_context, *args):
             # Is an instance, not a class.
             tree_context, = execute_evaluated(tree_context)
 
-    return MixedObject(
-        evaluator,
-        parent_context,
-        compiled_object,
-        tree_context=tree_context
-    )
+    return ContextSet({
+        MixedObject(
+            evaluator,
+            parent_context,
+            compiled_object,
+            tree_context=c,
+        ) for c in to_stub(tree_context) or [tree_context]
+    })

jedi/evaluate/gradual/conversion.py

@@ -102,10 +102,10 @@ def _load_stub_module(module):
 
 
 def name_to_stub(name):
-    return ContextSet.from_sets(_to_stub(c) for c in name.infer())
+    return ContextSet.from_sets(to_stub(c) for c in name.infer())
 
 
-def _to_stub(context):
+def to_stub(context):
     if context.is_stub():
         return ContextSet([context])
 
@@ -118,6 +118,13 @@ def _to_stub(context):
     if stub_module is None or qualified_names is None:
         return NO_CONTEXTS
 
+    was_bound_method = context.is_bound_method()
+    if was_bound_method:
+        # Infer the object first. We can infer the method later.
+        method_name = qualified_names[-1]
+        qualified_names = qualified_names[:-1]
+        was_instance = True
+
     stub_contexts = ContextSet([stub_module])
     for name in qualified_names:
         stub_contexts = stub_contexts.py__getattribute__(name)
@@ -128,4 +135,8 @@ def _to_stub(context):
             for c in stub_contexts
             if c.is_class()
         )
+    if was_bound_method:
+        # Now that the instance has been properly created, we can simply get
+        # the method.
+        stub_contexts = stub_contexts.py__getattribute__(method_name)
     return stub_contexts

test/test_api/test_interpreter.py

@@ -358,6 +358,12 @@ def test_name_not_findable():
     assert jedi.Interpreter("X.NOT_FINDA", [locals()]).completions()
 
 
+def test_stubs_working():
+    from multiprocessing import cpu_count
+    defs = jedi.Interpreter("cpu_count()", [locals()]).goto_definitions()
+    assert [d.name for d in defs] == ['int']
+
+
 def test_sys_path_docstring():  # Was an issue in #1298
     import jedi
     s = jedi.Interpreter("from sys import path\npath", line=2, column=4, namespaces=[locals()])