Completion now always takes a NamePart as input.

jedi/api/__init__.py

@@ -179,7 +179,9 @@ class Script(object):
         comps = []
         comp_dct = {}
         for c, s in set(completions):
-            n = str(c.names[-1])
+            # TODO Remove this line. c should be a namepart even before that.
+            c = c.names[-1]
+            n = str(c)
             if settings.case_insensitive_completion \
                     and n.lower().startswith(like.lower()) \
                     or n.startswith(like):

jedi/api/classes.py

@@ -430,7 +430,7 @@ class Completion(BaseDefinition):
         if isinstance(self._base, pr.Param):
             append += '='
 
-        name = str(self._name.names[-1])
+        name = str(self._name)
         if like_name:
             name = name[self._like_name_length:]
         return dot + name + append
@@ -457,7 +457,7 @@ class Completion(BaseDefinition):
 
         would return `isinstance`.
         """
-        return unicode(self._name.names[-1])
+        return unicode(self._name)
 
     @property
     def name_with_symbols(self):
@@ -575,8 +575,6 @@ class Definition(use_metaclass(CachedMetaClass, BaseDefinition)):
     """
     def __init__(self, evaluator, definition):
         super(Definition, self).__init__(evaluator, definition, definition.start_pos)
-        if not isinstance(definition, pr.NamePart):
-            raise NotImplementedError(definition)
 
     @property
     @underscore_memoization

jedi/api/keywords.py

@@ -1,9 +1,11 @@
 import pydoc
 import keyword
 
+from jedi.parser.representation import NamePart
 from jedi._compatibility import is_py3
 from jedi import common
 from jedi.evaluate import compiled
+from jedi.evaluate.helpers import FakeSubModule
 
 try:
     from pydoc_data import topics as pydoc_topics
@@ -40,7 +42,7 @@ def get_operator(string, pos):
 class KeywordName(object):
     def __init__(self, parent, name, start_pos):
         self.parent = parent
-        self.names = [name]
+        self.names = [NamePart(FakeSubModule, name, self, (0, 0))]
         self.start_pos = start_pos
 
     def get_definition(self):