[Zeklandia]

There are a few major convention changes, most notably that print is now a function and must be formatted differently to work. People are using libraries that aren't being updated because some people don't want to go update their old work, especially scientists who made the libraries as part of a paper years ago and haven't touched it since.

[FreakyT]

So glad they changed print to a function; the old syntax looked so out of place.