For Python, you pretty much just need to be aware of when the new major version is released because the "what's new" pages are pretty good. Here's the one in wh

For Python, you pretty much just need to be aware of when the new major version is released because the "what's new" pages are pretty good. Here's the one in which data classes were released: https://docs.python.org/3/whatsnew/3.7.html https://docs.python.org/3/whatsnew/3.7.html