[brianpgordon]

My experience is that you start out very productive not being weighed down by having to satisfy the type checker... but programs tend to grow over time and you end up regretting it. When you have a medium to large codebase in a dynamically typed language it gets to be more of a hindrance than a help.

[tomp]

I agree, but my point was rather that you can't typecheck Pandas (or a similarly complex library). Gradual typing for the win!