Modified patch from upstream (PyColorize.py was moved):

commit e5effe0eb43d57e3a34a9dd07a0c03e3a178b2f2

Author: Thomas Spura <tomspur@fedoraproject.org>

Date:   Tue Nov 2 10:19:58 2010 +0100

    pycolor: Wrong filename given -> print error

    When a user wanted to colorize a file, which doesn't exist, IPython

    would crash. This commit changes this, so the user gets a usefull

    message about the wrong filename.

    This fixes RH bug #628742.

    Signed-off-by: Thomas Spura <tomspur@fedoraproject.org>

diff --git a/IPython/utils/PyColorize.py b/IPython/utils/PyColorize.py

index 613ae19..ddf3f7a 100644

--- a/IPython/PyColorize.py

+++ b/IPython/PyColorize.py

@@ -277,7 +277,11 @@ If no filename is given, or if filename is -, read standard input."""

     if fname == '-':

         stream = sys.stdin

     else:

-        stream = file(fname)

+        try:

+            stream = file(fname)

+        except IOError,msg:

+            print >> sys.stderr, msg

+            sys.exit(1)

     parser = Parser()