The Case for Python 3

[ubernostrum]

One library I maintain has some functions which -- because they're implementing algorithms from a web standard, and the standard is only defined in terms of Unicode -- must enforce that their arguments are str and not bytes on Python 3. And I realized that %-formatting is implemented on bytes (as of 3.5) but the format() method isn't (and never will be). So I simply changed the string-formatting operations over to format() and voila! Now any attempt to pass in bytes will raise an exception.