id summary reporter owner description type status priority milestone component version resolution keywords cc 485 Spurious TemplateNotFound errors in App Engine caused by invalid 'rbU' file mode in TemplateLoader.directory Erik Swanson cmlenz "In TemplateLoader.directory, the file mode 'rbU' is specified, which is invalid. ('U' has no effect when a file is opened in binary mode 'b'.) This is a showstopper In the App Engine environment (I'm using Python 2.7), where attempting to open a file with this mode results in ""IOError: invalid mode: rbU"" being raised. This IoError is then incorrectly handled by TemplateLoader.load in the 'for loadfunc in search_path:' where there is a blind 'except IOError:' that suppresses it. The result that 'raise TemplateNotFound(filename, search_path)' is reached even when the template exists. " defect reopened major 0.9 General devel appengine