FWIW, the combination of limiting the PEP to binding expressions and the motivating example of sequential if/elif tests that each need to utilize an expression in their body (e.g. matching various regexen by narrowing, avoiding repeated indent) gets me to +1.

I still think the edge case changes to comprehension semantics is needless for this PEP. However, it concerns a situation I don't think I've ever encountered in the wild, and certainly never relied on the old admittedly odd behavior.

On Thu, Apr 26, 2018, 2:01 AM Tim Peters <tim.peters@gmail.com> wrote:
Yes, binding expressions in the current PEP support an extremely
limited subset of what Python's assignment statements support.[...]
Guido's if/elif/elif/elif/ ... complex text-processing example didn't,
but because the current lack of an ability to bind-and-test in one
gulp forced the `elif` parts to be ever-more-deeply-indented `if`
blocks instead.