On Thu, Dec 29, 2011 at 10:48 PM, Sayantan Datta <kenzo.zom...@gmail.com> wrote: > for line in sys.stdin : > for char in line : > sys.stdout.write(rotate13_letter(char)) > > cat sample.html | python rot13.py rot13.html
You're reading from stdin, which is correct, but you're writing to stdout and not redirecting it. You need to put an arrow before rot13.html to indicate redirection: cat sample.html | python rot13.py >rot13.html Note though that 'cat' is superfluous here; all you need to do is redirect input: python rot13.py <sample.html >rot13.html Hope that helps! Chris Angelico -- http://mail.python.org/mailman/listinfo/python-list
