When possible show meta info from completions.

In particular with Python this include the types of the object selected.

Also update the key binding to be more in line with IPython; Ctrl-O to
insert a new line.

Author: Carreau

jupyter_console/ptshell.py

@@ -150,9 +150,26 @@ def get_completions(self, document, complete_event):
             code=document.text,
             cursor_pos=document.cursor_position
         )
-        start_pos = content['cursor_start'] - document.cursor_position
-        for m in content['matches']:
-            yield Completion(m, start_position=start_pos, display_meta=content["metadata"].get(m, ""))
+        meta = content["metadata"]
+
+        if "_jupyter_types_experimental" in meta:
+            try:
+                new_meta = {}
+                for c, m in zip(
+                    content["matches"], meta["_jupyter_types_experimental"]
+                ):
+                    new_meta[c] = m["type"]
+                meta = new_meta
+            except:
+                pass
+
+        start_pos = content["cursor_start"] - document.cursor_position
+        for m in content["matches"]:
+            yield Completion(
+                m,
+                start_position=start_pos,
+                display_meta=meta.get(m, "?"),
+            )
 
 
 class ZMQTerminalInteractiveShell(SingletonConfigurable):
@@ -477,6 +494,10 @@ def _(event):
         def _(event):
             event.cli.suspend_to_background()
 
+        @kb.add("c-o", filter=(has_focus(DEFAULT_BUFFER) & emacs_insert_mode))
+        def _(event):
+            event.current_buffer.insert_text("\n")
+
         # Pre-populate history from IPython's history database
         history = InMemoryHistory()
         last_cell = u""