Re: [Python-Dev] chained assignment weirdity

On Thu, Nov 8, 2012 at 1:54 AM, Guido van Rossum wrote:

On Wed, Nov 7, 2012 at 4:13 AM, Ned Batchelder wrote:

...

We've gone out of our way to maintain backward compatibility with the implemented behavior before (ordering of dict keys, for example).

Not sure what you're referencing here -- didn't we just start randomizing hashing?

Hash randomization could have been quietly introduced as a security fix and backported to old versions. But since applications might have depended on dict iteration order, it wasn't - old versions of Python won't randomize hashes unless you set an environment variable. That's taking care of old code, even when that old code is depending on non-spec behaviour. ChrisA