Use getframe instead of stack

[RouganStriker]

The inspect.stack call is rather expensive and makes opening multiple contexts in a sequence rather expensive. Since we only need to grab a specific frame from the stack, we can opt for using getframe instead of fetching the entire stack.

[emily-bain]

+1.

This all looks technically sound to me, Good job on finding the alternate frame method that was a more efficient way to get the same thing we were getting via inspect.