chandra wrote: > On Jan 15, 12:22 am, "D'Arcy J.M. Cain" <da...@druid.net> wrote: > >> Just return False once you find a non-hex digit. >> >> def ishex(s): >> for c in s: >> if not c in string.hexdigits: return False >> >> return True >> >> And here are your unit tests. Every line should print "True". >> >> print ishex('123') is True >> print ishex('abc') is True >> print ishex('xyz') is False >> print ishex('0123456789abcdefABCDEF') is True >> print ishex('0123456789abcdefABCDEFG') is False >> > > Thanks to Iain and to you. > > One further question: even though it is a single function, is there > any way to convert it into a module? Can existing modules be enhanced > with functions such as these? If not, how may I make my own module, > called, say mystring? At present, I am saving the file as ishex.py and > calling it after declaring > > from ishex import ishex > > Is there a more elegant way to integrate this function and make it > available to other python scripts using the import mechanism? > Nope, that's about as elegant as it gets.
You can, of course, include it in a generic utility module and import several things from that module - you aren't limited to defining a single object in a module. regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 PyCon is coming! Atlanta, Feb 2010 http://us.pycon.org/ Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS: http://holdenweb.eventbrite.com/ -- http://mail.python.org/mailman/listinfo/python-list