From 3a42b33124d6036dacee85867e484cb25d32a903 2016-07-21 12:36:33
From: Thomas Kluyver <thomas@kluyver.me.uk>
Date: 2016-07-21 12:36:33
Subject: [PATCH] Create a QApplication for inputhook if one doesn't already exist

Closes gh-9784

---

diff --git a/IPython/terminal/pt_inputhooks/qt.py b/IPython/terminal/pt_inputhooks/qt.py
index ebf3a94..34c9618 100644
--- a/IPython/terminal/pt_inputhooks/qt.py
+++ b/IPython/terminal/pt_inputhooks/qt.py
@@ -1,10 +1,15 @@
 import sys
 from IPython.external.qt_for_kernel import QtCore, QtGui
 
+# If we create a QApplication, keep a reference to it so that it doesn't get
+# garbage collected.
+_appref = None
+
 def inputhook(context):
+    global _appref
     app = QtCore.QCoreApplication.instance()
     if not app:
-        return
+        _appref = app = QtGui.QApplication([" "])
     event_loop = QtCore.QEventLoop(app)
 
     if sys.platform == 'win32':