[Python-Dev] PEP 572: Assignment Expressions (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Tue Apr 24 23:40:49 EDT 2018

On 25 April 2018 at 06:23, Mike Miller <python-dev at mgmiller.net> wrote:

Now, I agree that's not a difference of much consequence, but the difference from "import as" is not either.

Since this example has been brought up by a few folks now, I'll note that "import x.y.z as c" has never been entirely equivalent to a simple assignment, since it also avoids the default binding of "x" in the current namespace.

These days, it's diverged even further, since we added a fallback to looking for the full "x.y.z" key in sys.modules if any part of the submodule lookup chain gets an AttributeError.

The proposed name binding expressions aren't like that - they really are just an ordinary binding of the result of the given expression to the given name.

Cheers, Nick.

-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia

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