Allow showing dict keys only

IPython/core/completer.py

@@ -1000,6 +1000,9 b' class IPCompleter(Completer):'
         else:
             self.splitter.delims = DELIMS
     
+    dict_keys_only = Bool(False,
+        help="""Whether to show dict key matches only""")
+
     merge_completions = Bool(True,
         help="""Whether to merge completion results into a single list
         
@@ -1113,6 +1116,9 b' class IPCompleter(Completer):'
     @property
     def matchers(self):
         """All active matcher routines for completion"""
+        if self.dict_keys_only:
+            return [self.dict_key_matches]
+
         if self.use_jedi:
             return [
                 self.file_matches,