> > > > > That is *very* unlikely. > Perhaps, but I assure you it is what is happening.
> > > Verify that you deleted the existing mod1.xml. As you open the file in > > append mode existing faulty lines persist. > I did, hence the above assurance. Here's the modified code: #!/usr/bin/env python stx = '\x02' etx = '\x03' with open('input/PS06Test_100Packages.xml', 'r') as f1: with open('mod1.xml', 'a') as f2: for line in f1: s = stx + line[:-1] + etx f2.write(s) mod1.xml has the \x02 hex at the beginning of line 1, then line 2 and all further lines begin with the \x03 hex then the \x02 hex and then the line. regards, Richard _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor