From a55b74a629425e3344c8bad7b5994ebfc5b12085 2010-10-10 05:16:27
From: Fernando Perez <Fernando.Perez@berkeley.edu>
Date: 2010-10-10 05:16:27
Subject: [PATCH] Work around bug in pprint.pformat.  Closes gh-148

---

diff --git a/IPython/core/displayhook.py b/IPython/core/displayhook.py
index 55accc5..b98a3bd 100644
--- a/IPython/core/displayhook.py
+++ b/IPython/core/displayhook.py
@@ -193,7 +193,11 @@ class DisplayHook(Configurable):
         """
         try:
             if self.shell.pprint:
-                result_repr = pformat(result)
+                try:
+                    result_repr = pformat(result)
+                except:
+                    # Work around possible bugs in pformat
+                    result_repr = repr(result)
                 if '\n' in result_repr:
                     # So that multi-line strings line up with the left column of
                     # the screen, instead of having the output prompt mess up
diff --git a/IPython/core/hooks.py b/IPython/core/hooks.py
index 2dc377e..1894572 100644
--- a/IPython/core/hooks.py
+++ b/IPython/core/hooks.py
@@ -163,7 +163,11 @@ def result_display(self,arg):
     """
     
     if self.pprint:
-        out = pformat(arg)
+        try:
+            out = pformat(arg)
+        except:
+            # Work around possible bugs in pformat
+            out = repr(arg)
         if '\n' in out:
             # So that multi-line strings line up with the left column of
             # the screen, instead of having the output prompt mess up