__missing__ for the top-level Python script

Ethan Furman ethan at stoneleaf.us
Wed Nov 12 15:54:56 CET 2014

On 11/12/2014 06:37 AM, Chris Angelico wrote:
> On Mon, Nov 10, 2014 at 10:31 AM, Chris Angelico <rosuav at gmail.com> wrote:
>> So the semantics should be: If NameError would be raised (not
>> including UnboundLocalError, which still represents an error), attempt
>> to import the absent name. If successful, continue as if it had
>> already been done. If ImportError is raised, suppress it and let the
>> original NameError happen.
> No bites? I'd have thought there'd be a few crazy ideas thrown out in
> answer to this.
> What if it's worded as a feature for interactive Python? Save you the
> trouble of explicitly importing modules, by auto-importing them in
> response to usage. In theory, it's as simple as adding __missing__ to
> globals(), but I don't know of a way to do that for the main module.

You might check out https://docs.python.org/3/library/sys.html#sys.excepthook


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