Why is this discussion talking about comprehensions at all? Is there a decent use case for using assignments in comprehensions (as opposed to language lawyering or deliberate obfuscation)?
On Thu, 28 Jun 2018 01:25:14 +1200 Greg Ewing email@example.com wrote:
Ivan Pozdeev via Python-Dev wrote:
Using this assigned result elsewhere in the same expression (akin to regex backreferences) is not a part of the basic idea actually.
If that's true, then the proposal has mutated into something that has *no* overlap whatsoever with the use case that started this whole discussion, which was about binding a temporary variable in a comprehension, for use *within* the comprehension.
It depends on the evaluation order (and whether something is evaluated at all),
Which to my mind is yet another reason not to like ":=".