Fixed in 1.1 ============ Issues addressed by following patches are already fixed in IronPython 1.1. You are advised to upgrade. `patch-ironpython-base64-slash`__ This patch fixes an issue that strings with slashes are incorrectly decoded by base64 module. `patch-ironpython-compile-co-filename`__ This patch sets co_filename attribute for code objects compiled by built-in function compile(). `patch-ironpython-flags-and-argcount`__ This patch fixes bugs in co_flags and co_argcount attributes of code objects. `patch-ironpython-func-defaults`__ This patch sets func_defaults attribute of function objects to None instead of empty tuple when no default values are present. `patch-ironpython-set-func-name`__ This patch fixes an issue that setting func_name has no effect on string representation of the function. `patch-ironpython-unicodeerror-object`__ This patch fixes an issue that UnicodeError objects don't have "object" attribute representing the original unicode object to be encoded. __ https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/1.1a1/patch-ironpython-base64-slash __ https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/1.1a1/patch-ironpython-compile-co-filename __ https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/1.1a1/patch-ironpython-flags-and-argcount __ https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/1.1a1/patch-ironpython-func-defaults __ https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/1.1a1/patch-ironpython-set-func-name __ https://fepy.svn.sourceforge.net/svnroot/fepy/trunk/patches/1.1a1/patch-ironpython-unicodeerror-object