fix dictionary index problems

jedi/evaluate_representation.py

@@ -815,26 +815,27 @@ class Array(use_metaclass(cache.CachedMetaClass, pr.Base)):
         return set(result)
 
     def get_exact_index_types(self, mixed_index):
-        """ Here the index is an int. Raises IndexError/KeyError """
+        """ Here the index is an int/str. Raises IndexError/KeyError """
         index = mixed_index
         if self.type == pr.Array.DICT:
             index = None
             for i, key_statement in enumerate(self._array.keys):
                 # Because we only want the key to be a string.
-                key_elements = key_statement.get_commands()
-                if len(key_elements) == 1:
+                key_commands = key_statement.get_commands()
+                if len(key_commands) == 1:
+                    key = key_commands[0]
+                    key.get_code()
                     try:
-                        str_key = key_elements.get_code()
+                        str_key = key.get_code()
                     except AttributeError:
-                        try:
-                            str_key = key_elements[0].name
-                        except AttributeError:
-                            str_key = None
+                        str_key = None
                     if mixed_index == str_key:
                         index = i
                         break
             if index is None:
                 raise KeyError('No key found in dictionary')
+
+        # Can raise an IndexError
         values = [self._array.values[index]]
         return self._follow_values(values)