Agreed. This example highlights the great savings of the [... _ ...] syntax in Arc (which I'd imagine is a fairly common use-case, especially for map, filter, e

Agreed. This example highlights the great savings of the [... _ ...] syntax in Arc (which I'd imagine is a fairly common use-case, especially for map, filter, etc.). Although ironically in this case, I'd probably use the following: def vectorDotProduct(vector1, vector2): return map(op.mul, vector1, vector2) (where op has been imported previously using: import operator as op ) I'm not really sure how idiomatic this is, but I find that 90% of the time when I use map in python, it's with the operator module.