On Wed, May 30, 2018 at 7:59 PM, Neil Girdhar <mistersheik@gmail.com> wrote:
z = {a: transformed_b
     for b in bs
     given transformed_b = transform(b)
     for a in as_}

There is no nice, equivalent := version as far as I can tell.

Well you could just do:

    z = {a: b
         for b in (transform(bi) for bi in bs)
         for a in as_}