ImportError raised if ipywidgets is missing during IPythonProgressBar.

QInfer · Apr 27, 2016 · a5e143f · a5e143f
1 parent c5ff7cf
commit a5e143f
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/qinfer/ipy.py b/src/qinfer/ipy.py
@@ -55,6 +55,8 @@ class IPythonProgressBar(object):
         classes.
     """
     def __init__(self):
+        if ipw is None:
+            raise ImportError("IPython support requires the ipywidgets package.")
         self.widget = ipw.FloatProgress(
             value=0.0, min=0.0, max=100.0, step=0.5,
             description=""