Fix interpreter issues with modules

jedi/api/interpreter.py

@@ -27,11 +27,11 @@ class MixedModuleContext(Context):
         self.evaluator = evaluator
         self._namespaces = namespaces
 
-        raise NotImplementedError("module names")
         self._namespace_objects = [NamespaceObject(n) for n in namespaces]
         self._module_context = ModuleContext(
             evaluator, tree_module,
             path=path,
+            string_names=('__main__',),
             code_lines=code_lines
         )
         self.tree_node = tree_module