Merge pull request #1287 from astrofrog/fix-ipython-import-error

Fixed import of IPython UnknownBackend for IPython 4.0

CHANGES.md

@@ -6,6 +6,8 @@ v0.10.3 (unreleased)
 
 * Fixed bugs with saving and restoring of various types of subset states. [#1285]
 
+* Fixed a bug that caused glue to not open when IPython 4.0 was installed. [#1287]
+
 v0.10.2 (2017-03-22)
 --------------------
 

glue/app/qt/application.py

@@ -54,7 +54,14 @@ def _fix_ipython_pylab():
         return
 
     from IPython.core.error import UsageError
-    from IPython.terminal.pt_inputhooks import UnknownBackend
+
+    # UnknownBackend exists only in IPython 5.0 and above, so if it doesn't
+    # exist we just set UnknownBackend to be a fake exception class
+    try:
+        from IPython.terminal.pt_inputhooks import UnknownBackend
+    except ImportError:
+        class UnknownBackend(Exception):
+            pass
 
     try:
         shell.enable_pylab('inline', import_all=True)