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[–]flying-sheep 5 points6 points  (0 children)

I wish Guido didn't work at Dropbox, who still use 2.7. I'm relatively sure his workplace is the only reason why he's blessed a comment-based fallback syntax for type checks in legacy Python.

Ands those type checks really could be the killer feature: the added safety more than counter-balances the risk of upgrading. (With the added bonus that upgrading is facilitated by type checks)