From 939959b258f3f7608a062d4431ddd37511d8f91f 2017-09-14 07:23:05
From: Thomas Kluyver <takowl@gmail.com>
Date: 2017-09-14 07:23:05
Subject: [PATCH] Merge pull request #10805 from ipython/auto-backport-of-pr-10797

Backport PR #10797 on branch 5.x
---

diff --git a/IPython/core/completer.py b/IPython/core/completer.py
index c1d43cd..b386945 100644
--- a/IPython/core/completer.py
+++ b/IPython/core/completer.py
@@ -1093,6 +1093,12 @@ class IPCompleter(Completer):
                     return [cast_unicode_py2(r) for r in res if r.lower().startswith(text_low)]
             except TryNext:
                 pass
+            except KeyboardInterrupt:
+                """
+                If custom completer take too long,
+                let keyboard interrupt abort and return nothing.
+                """
+                break
 
         return None