Fixed import of IPython UnknownBackend for IPython 4.0

glue-viz · Apr 19, 2017 · 0761163 · 0761163
1 parent d266985
commit 0761163
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diff --git a/CHANGES.md b/CHANGES.md
@@ -13,6 +13,8 @@ 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.
+
 v0.10.2 (2017-03-22)
 --------------------
 

diff --git a/glue/app/qt/application.py b/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)